Overview | The Beginning: From Bresser Venus 76/700 AZ to 10" Meade Lightbridge Dobson | The Mini Dobson Phase | Changes: From 10" down to 8" and 6", Entering DSO Observation and GoTo | Additions and New Topics | Timeline | Links
On this page I provide an overview of my "astronomy history" - probably more for myself than for others...
My "astronomy history" is, of course, primarily of interest to me. If you are interested in it as well, you can read it on this page. I have arbitrarily divided the history into four phases in order to bring some structure into this matter. In addition, my history is mainly oriented along telescopes that I bought over time. Therefore I added a "timeline" to this page, which lists the events in chronological order.
The phases are:
This phase comprises my very first telescopes up to my large 10" Dobsonian telescope. During this phase, I rarely got beyond the observation of sun, moon, and planets.
My very first telescope was a Bresser Venus 76/700 AZ telescope (Newton), and I do no longer remember when I bought it (1998 or earlier) and where (Aldi or Tchibo probably...). In 1999, I sold the telescope to my brother-in-law after purchasing a Meade ETX-90EC. Later, I bought it back from him again and sold it to a colleague (he thinks so...). I do not remember what I observed with this telescope, probably just the moon and some planets.
>> For details see page Bresser Venus 76/700 AZ Information.
At some point in the late 90s, I came across the Meade ETX-90EC, a small Maksutov telescope for which Michael Weasner had set up his own Website (later, the ETX-125 and other models were added). Everyone was enthusiastic about this telescope, and so was I. I would have liked to buy it too, but it was difficult to get it in Germany. So I took the opportunity of a business trip to a conference in Pittsburgh in May 1999 and bought an ETX-90EC (ETX 90/EC with Autostar 497 computer, 26 mm Series 4000 eyepiece, and 5 x 25 straight viewfinder) at the airport with a matching telescope bag. Since the customs in Frankfurt checked more strictly on the day I returned home, I declared the telescope at the customs and had to clear it expensively. Thus, the purchase was not as cheap as I had hoped for! The customs needed a lot of time for the whole procedure, the numbers on the customs invoice were neatly "painted," I had to go outside again to withdraw money with my credit card, and then I did not get back into customs again, so that the taxi driver who was supposed to pick me up had already called me out. "He will wait for you," the customs officers said unaffected when I urged for hurrying up. Last but not least, the taxi driver forgot his key at the airport, so he had to return to the parking garage. A great start!
I purchased several accessories for the ETX-90EC (see page Meade ETX-90EC Equipment), for example a sun filter, an angle finder, a table tripod and various eyepieces, the latter mainly at Astro-Himmel in Sulzbach. This shop was not that far away from my home, but a visit there always meant a little "world trip" to the Kraichgau... Mr. Himmel had "soaked up" himself for the joy of astronomy with a lot of equipment and set up a shop for it. He probably "stuck" on it at the end - the shop unfortunately does no no longer exist since many years. Mr. Himmel even wanted to import some parts for me from the USA, but that did not work out, so I bought them from another dealer.
The ETX was said to have poor mechanics (while the optics were highly praised), and I can confirm this. Very soon, a drive part on the right? side was broken. First we glued it, which worked, but then I wrote to Meade in the USA and asked for a spare part. This was delivered free of charge together with the installation instructions. The problem was also known on the Internet, and there were repair instructions for it. So I managed to replace the defective part.
Motor control and tracking never worked satisfactorily for me. I bought the table tripod to be able to use the ETX as a GoTo telescope, but I never managed to get the GoTo control to work. In addition, updates to the Autostar computer were only possible via Windows and a serial interface, which caused me big problems on the Mac. Before there were Intel Macs, Windows emulators unfortunately only ran very slowly... So I used the ETX practically only like a kind of Dobsonian telescope...
In 1999 I used the ETX-90EC to observe a total solar eclipse. That was almost the climax of its "career" with me! The Venus transit in June 2004 was another one. It turned out that the ETX-90EC is an ideal lunar and planetary telescope. For deep sky objects (nebulae, galaxies) I did not find it suitable: while searching for a comet (probably 153P/Ikeya-Zhang, 2002) and for the Andromeda galaxy I experienced only failures... I suppose this was due to the telescopes slow aperture ratio (1:13.8) and the small aperture (90 mm).
Therefore I bought a Meade 10" Dobsonian truss telescope in October 2009, and sent the ETX-90EC to the dealer for resale at the end of 2009. He sold it for 120 EUR (that is what I got...). "That is all the market had to offer," he said; the telescope also had some defects.
In October 2009, I purchased a Meade 10" Lightbridge Dobsonian truss telescope (a demonstration model) because I was not satisfied with the ETX-90EC for the reasons described above. Now it should be really much aperture, and because I used the ETX-90EC basically like a Dobsonian telescope, the purchase of such telescope was obvious. More Dobsonian telescopes, especially for travel and quick-and-dirty observations, should follow in the years to come! So, after this purchase, I rode for some time the "Dobsonian wave"...
>> For details see page Meade Lightbridge Information.
After initial attempts at the moon and some planets, I used the 10" Dobsonian telescope less and less. This was due to the weight (more than 17 kg for the tube, 31 kg in total): especially in view of my poor hips the telescope proved to be too heavy for me. On the other hand, I was not really satisfied with the results of the telescope, especially since the difference in image quality to the Sky-Watcher Heritage P130, which I bought as a travel telescope afterwards, was not as evident for me as I had expected. So it turned out in practice that I mostly preferred the smaller Dobsonians, which I had bought afterwards (see below), to the 10-incher for my mostly "quick-and-dirty observations"... Attempts on deep sky objects (except for the Andromeda galaxy M 31 and the Orion Nebula M 42) were also scarce for this reason. An "entry" into the DSO world simply did not happen... Today, however, I also know that this cannot succeed, if one does not concern oneself with DSO in more detail (that is, for example, that one acquires books and also reads these, that one informs oneself before an observation session what can be observed, etc.), and I had not done this as well...
Probably my demands/expectations on the image quality of the telescope were too high because of its large aperture, especially since the observation conditions (the "seeing") were not always the best ( I especially had to struggle a lot with air turbulence). Maybe I should have bought a collimator. At the beginning I did not dare to collimate the telescope (but actually the telescope did not seem so misaligned when I later checked it for the first time with a collimation laser...). In hindsight, I believe that the Meade LightBridge was definitely better than all the smaller telescopes that I bought later and that I simply had wrong expectations...
So I sold the telescope in March 2016 to an ex-colleague (for little money...) and replaced it with a GSO GSD 680 Dobsonian telescope with 8" aperture, which was a bit lighter. I was not able to make any comparisons between the two telescopes, because I had already sold the 10" telescope when the 8" telescope arrived...
In this phase, I supplemented my 10" Dobsonian telescope with small, low-cost Dobsonian telescopes, in order to also have a telescope that can be taken on vacation. As you can read, this path was not quite straightforward. During this phase as well, I rarely got beyond the observation of the sun, the moon, and the planets.
Because the 10" telescope was so large and heavy and therefore not suitable for traveling, I bought an additional Sky-Watcher Heritage P130 Dobsonian telescope in February 2010. It was intended to be a travel telescope, but it quickly became apparent that it was too big for that purpose. So I soon added some smaller "Dobsonian brothers" (Heritage 76 and 100P), which were better suited for traveling. More about this below!
The Heritage P130 telescope is located between the "toys" and the more serious amateur telescopes. It performs surprisingly well and even has an adjustable parabolic mirror with a center marking. Only the inaccurate eyepiece extension and the trembling of the suspension disturbed me sometimes more, sometimes less. Unfortunately, the eyepiece extension could not be replaced (and I do not know of anyone who was able to do that...). Altogether, I have been able to observe numerous DSO with this telescope, particularly after 2016, when I entered more seriously into the deep sky observations - and this both with its own Dobsonian mount and on the later acquired Sky-Watcher Star Discovery AZ GoTo mount. Apart from the two negative points mentioned above, I was very satisfied with this telescope, even though I did not use it as a travel telescope as was the original intention.
In April 2017, however, I bought a 6" Newtonian tube to replace my 8" Dobsonian telescope, which had also become too heavy for me. So the Heritage P130 became a little bit "redundant," because its technical data was very similar to the 6" tube (not from the technical side, the Newton was much better in this respect...). Therefore I gave the Heritage P130 away to a friend in the middle of April 2017.
At Christmas 2013, my friend had been given a mini-Dobsonian telescope (Celestron FirstScope 76) as a present by his children (76 mm aperture, 300 mm focal length). I found this telescope so "cute" that I wanted to buy one as well - as a travel telescope, because the Heritage P130 seemed too large and heavy for this purpose. I did so at the end of January 2014, but I bought the version of Sky-Watcher (Heritage 76), in part because it is equipped with better eyepieces.
After I had read some very satisfied reports on the Internet, I was soon disillusioned: newer specimens were no longer delivered with a parabolic mirror, only with a spherical mirror. Accordingly, the image quality was disappointing. Although I could not tell whether my specimen had a spherical or a parabolic mirror, I was at least able to state that the image quality was poor. Consequently, the Heritage 76 was taken "out of service" again and soon replaced by a slightly larger Sky-Watcher Heritage 100P. That model had at least a parabolic mirror, even if it was not adjustable. Nevertheless, I appreciated the small size and the handiness of the nice little Heritage 76 compared with its bigger brother 100P!
When I sold my 10" Dobsonian telescope in March 2016, I gave the Heritage 76 to the buyer as a gift to his daughter. From the end of February to mid-March 2017, I borrowed the Celestron 76 from my friend for some time and put it through its paces. More about this below!
Because I was not satisfied with the image quality of the smaller Sky-Watcher Heritage 76, I purchased its larger brother Heritage 100P as a travel telescope at the beginning of July 2015. This telescope may not have a good reputation, but I was very satisfied with it, because it was small and handy on the one hand, and on the other hand it delivered quite good image quality thanks to the parabolic mirror, at least if you consider the reasonable price (experts will surely only smile at this "toy telescope"...). The Heritage 100P was unfortunately not as easy to transport as a Heritage 76, but the much better image quality than the one that at least my copy of the 76 had more than outweighed this.
For a long time, the Heritage 100P was my most-used telescope, which can also be seen from the list of observed DSO (from 2016 on). It was quickly set up on the terrace table or on another table - and I was ready to start observing. Beside DSO, I also observed the moon, the planets, and the sun with it. The Mercury passage in 2016 was certainly a highlight with the 100P. Besides on its own base, I also used the tube on the Sky-Watcher Star Discovery AZ GoTo mount and on the Sky-Watcher AZ Pronto mount.
Since this telescope was somewhat redundant with my new Omegon Photography Scope 72/432 (I compared both telescopes), I decided at the end of March 2019 to part with it, although I liked it very much, and gave it to my brother.
In this phase I did a rather unusual "backward movement" with respect to my largest telescope from 10" down to 8" and then even to 6" (most hobby astronomers move towards larger and larger apertures...). At the same time, supported by using automatic tracking and GoTo control, I finally "really" entered the realm of DSO observation. This was achieved through purchasing books and an intensively diving into the matter.
My Meade 10" LightBridge Dobsonian telescope had become too heavy for me, so that I had not used it much. At the end of March 2016, I therefore decided to replace it with a lighter 8" Dobsonian telescope. My choice fell after longer research on the GSO GSD 680 in the "luxury version." First experiences with the 8 inch telescope looked promising, but soon it turned out that I did not use this telescope as often as it deserved. This can be easily recognized by the small number of observed DSO.
>> For details see page GSO GSD 680 Information (8" Dobson).
Finally, the weight of this telescope (base 11.2 kg; net weight of optical tube 9.5 kg; total net weight approx. 21 kg) was still quite high for me - too high in the end. And also the handiness had its limits for me. In addition, because of its weight, this tube could not be used on my Sky-Watcher Star Discovery AZ GoTo mount acquired in the same year. The Heritage P130 and 100P as well as my Skymax-102, which I bought in 2016, were usable and used on this mount. In plain language this meant that I preferred other telescopes and used the GSD680 only rarely.
I therefore replaced the GSD680 with a 6" Newtonian tube, which - with some restrictions - can still be used on the GoTo mount, and gave it to a dealer in commission in April 2017 (it is now sold).
I purchased the Sky-Watcher Virtuoso mount with the Heritage 114P in May 2016 to make it easier for me to show sky objects to other people because it can track them thanks to automatic tracking (not GoTo!). By the way, the device can be extended with a hand box and thus transformed into a GoTo telescope.
>> For details see page Sky-Watcher Heritage 114P/Virtuoso Information (4.5" Dobson).
After a little more than month, I returned this telescope because the Virtuoso mount did not work properly for me. As a replacement, I purchased the Sky-Watcher Star Discovery AZ GoTo mount in July 2016. See below for more!
I purchased this tube at the end of May 2016 after consulting my astronomy dealer Mr. Kloß. The Sky-Watcher Skymax-102 OTA (1300 mm focal length) is a Maksutov-Cassegrain tube, which can achieve higher magnifications than Newton telescopes of the same aperture and is therefore particularly suitable for observations of the sun, the moon, and planets.
>> For details see page Sky-Watcher Skymax-102 OTA Information (4" Maksutov-Cassegrain).
Initially, I used the tube on the Heritage 100P base, but also on the Sky-Watcher Star Discovery AZ GoTo mount. Since I owned the Sky-Watcher AZ Pronto mount, I used it mainly on this one. Because of its small size and its relatively low weight, the Skymax-102 OTA is also suitable as a spotting scope, then best mounted on a photo tripod and with Amici prism for a "correct" image. Because I bought a used 5" Maksutov-Cassegrain tube in November 2017, this tube became a bit "redundant" with the 5" tube. I therefore sold it at the end of August 2018.
As a replacement for the Sky-Watcher Virtuoso control, I purchased the Sky-Watcher Star Discovery AZ GoTo telescope mount in July 2016 (sold without a telescope tube), although I did not really want to have a GoTo mount. But my astronomy dealer advised me and there was nothing comparable to the Virtuoso mount on the market (except the similar Merlin mount...). This heralded the age of GoTo observation for me, too!
>> For details see page Sky-Watcher Star Discovery AZ GoTo telescope mount.
In principle I could/can use all my telescopes on this mount, whereby the Explorer 150PDS (see figure above to the right), which I bought later, is already a "borderline" case because of its weight.
Naive, that is, when buying, one thinks that with the purchase of such a mount and other aids (see additions) one has overcome all problems in finding DSO. In reality this is unfortunately not the case. More on this on the respective pages about the mount and adapters!
Until the middle of 2016, I had primarily been concerned with the sun, moon, and planets. Only rarely did I observe a so-called "deep sky object, " let alone that I knew what the term included. Now I bought books and maps on this subject and began to create my own lists of "observable" sky objects based on these sources. I orientated myself on the recommendations of the books (especially Stoyan's book) and also on recommendations given to beginners on the Internet. In addition, I created small notes with objects that I could/would observe in a certain period of time and sometimes made sketches to find the objects. I worked relatively soon with a GoTo control, but at the same time I also accessed the objects manually, among others, on vacation. With respect to well-known objects (the "classics"), I often knew anyway how to find them. However, finding objects with and without GoTo was always a source of frustration.
For certain periods of time, I created observation protocols, and still do so (state: autumn 2019). In addition, I created a complete list of observed DSO, which now includes well over 100 objects, with an emphasis on Messier objects. Above all, I observe open and globular clusters, because these are less sensitive to light pollution and therefore easier for me to find. At some point in time, I also started to create pages with information and observation data for the individual objects. This is a lot of work and full of mistakes - but better than nothing. So far, I have avoided to use computer-based planning and logging of observations...
>> For details see page My Deep Sky Observations - Overview.
In July 2016 I purchased a SouthernStars SkyWire Serial Accessory (wired) to control the mount with SkySafari and iPad. Basically, the SkyWire Serial Accessory worked seamlessly with the Star Discovery mount and the SkySafari program on the iPad. On the positive side, it does not require any power supply. I found the cable connection annoying, as it prevented me from quickly putting the iPad down somewhere. Often I put it on the floor, which was not optimal... For just a RS232-to-USB converter, the price tag was quite steep...
>> For details see page Sky-Watcher Star Discovery AZ GoTo Mount - SkyWire Information.
I gave the SkyWire Serial Accessory away after buying a SynScan WLAN adapter in May 2019.
For some time, I was interested in the famous Astroscan telescope made by Edmund Scientific Corporation from 1976 to 2013. A used buy/import from the USA was expensive and was therefore out of the scope for me. The "mastermind" behind this telescope was Norman Sperling, who in 2016 tried to revive the telescope, now called Bright-Eye, in a Kickstarter campaign. I contacted him with respect to the new telescope, but unfortunately this lead to nowhere... I also came across the Sky-Watcher Infinity 76 and the Omegon version of it, which look like an imitation of the Astroscan telescope. And so I thought that I try out this "children's telescope," which corresponds to the Sky-Watcher Heritage 76 or Celestron FirstScope 76 (300 mm focal length) from the technical data perspective, and bought it in the Omegon version in February 2017.
>> For details see page Omegon 76/300 (Sky-Watcher Infinity 76) Information.
I find the principle adopted from the Astroscan telescope to move a sphere in a shell for alignment ingenious and also more stable than many mini-Dobsonians. But without any kind of viewfinder, searching for sky objects becomes a game of patience, and only a few children will have this patience. I also think that it is funny that you can hold the telescope like the Astroscan in your hand, but that is certainly not for children... All in all, the Infinity 76 is unfortunately only a bad copy of its famous model, which is mainly due to the eyepieces and how they are attached. In January 2019 I gave the telescope away to neighboring children.
As already reported, my 8" GSO GSD 680 Dobsonian telescope was still too heavy for me; moreover, I used it rarely also for other reasons. That is why, after some research, I bought a Sky-Watcher Explorer 150PDS tube at the beginning of April 2017 (shown on the Sky-Watcher Star Discovery AZ GoTo mount), especially since it seemed initially that this tube could be used on my Star Discovery GoTo mount without any problems. Unfortunately, it turned out that the tube was heavier than I first thought and that the mount can carry less weight than I first assumed. However, my astronomy dealer Mr. Kloß reassured me in this matter, and it looks as if this combination works (let us see for how long...). But it still seems to be borderline case to me...
>> For details see page Sky-Watcher Explorer 150PDS Information (6" Newton).
First observation experiences with the 6" tube looked promising, also in connection with the Atik Infinity camera. But a 6" telescope is, of course, not an 8" one! In a quick comparison, the GSD680 was slightly superior to the 150PDS. I did a corresponding comparison with the 5" Heritage P130 Dobsonian telescope a few days later. Overall, and hardly surprisingly, the image in the PDS150 was slightly better than in the P130, although I would not say that the differences were earth-shaking. Overall, however, I did not see any advantage in owing both telescopes, even though the P130 is certainly more suited to traveling. So I gave the P130 away to a friend in mid-April 2017.
I observed numerous DSO with this telescope, even though I used it less frequently than my smaller telescopes. In any case, the Explorer 150PDS is a very universal telescope that bet all my existing telescopes and was also ideal for the Atik Infinity camera that I purchased in late 2017 (see below). However, at the end of 2019, I bought a Celestron C8 to try once out again more aperture. Unfortunately, despite its many advantages, the Explorer 150PDS was thus somewhat redundant in my telescope park, and I sold it in mid-January 2020.
With the acquisition of the Explorer 150PDS in April 2017, my telescope equipment was basically "rounded off" and coordinated: a 4" Dobsonian for a large field of view and observing DSO, sun and moon, a 4" Maksutov-Cassegrain for sun, moon and planets (and perhaps some bright DSO), as well as a 6" telescope as a "universal telescope" and also for weaker DSO. All tubes could be used on my Star Discovery GoTo mount. There was only one thing that I was thinking about, the Skymax-102. My astronomy dealer Mt. Kloß once told me that the larger Skymax-127 might be even better. But later he could not remember this statement and found that the Skymax-102 shows the nicer image. Nevertheless, I could not get the Skymax-127 out of my head. But this was not the only change for me: With the order of a Unistellar eVscope (expected in February 2020) and the purchase of an Atik Infinity camera, the age of "fast astronomy photography" was heralded for me!
In November 2017, I found by chance a small ad for a used Sky-Watcher Skymax-127, not far from my home. I decided to go there and bought the tube.
>> For details see page Sky-Watcher Skymax-127 OTA Information (5" Maksutov-Cassegrain).
The Skymax-127 OTA (1500 mm focal length) is a Maksutov-Cassegrain tube which can achieve higher magnifications than Newtonian telescopes of the same aperture and is therefore particularly suitable for observing the sun, the moon, and the planets. For a long time I compared the Skymax-127 with its little brother Skymax-102 without finding any serious differences. At least the image in the SM-127 was a little larger because of the longer focal length and sometimes the view in the SM-127 seemed to have more contrast. As a spotting scope, the SM-102 was much more handy than the SM-127 and much more transportable, but the image in the SM-102 did not convince me, especially for photos. And so I decided to part with the SM-102 on occasion. This opportunity arose in August 2018, when my nephew was looking for a telescope that he wanted to give to his father (my brother) as a Christmas present...
In the beginning, I used the SM-127 very little, because after the sale of the Heritage P130 I did not have a suitable mount anymore. This changed after I bought an AZ Pronto mount, but the Skymax-127 is a bit too heavy for this. I already used the SM-127 tube on the Sky-Watcher Star Discovery AZ GoTo mount, but there the effort is always a bit higher, until you can start observing. Since I do not own the Skymax-102 any more, the Skymax-127 is now used more often anyway!
In November 2017, I heard about the Unistellar eVscope via the "Abenteuer Astronomie" newsletter for the first time. A Kickstarter campaign for this new telescope had already been running for a few weeks (it ran until November 24, 2017 with over 2100 supporters and over 2 million dollars in support capital), and I decided to participate in this campaign, as well. Unfortunately, it was already far too late for any of the two cheap offers... The delivery of the telescope, which can be attributed to "electronically augmented astronomy" (EAA), was originally announced to start in November 2018. But it was postponed on May 3, 2018 to May 2019, on March 18, 2019 to at least September 2019, and on September 26, 2019 to the period from December 2019 to February 2020. On Janaury 30, 2020 an announcement was made that all the buyers will receive a delivery date in the near future, and that deliveries will extend into the whole May 2020. I got my eVscope on January 27, 2020, but it quit its service already on the next day after the first observation session. The internal microSD card from which the control program is loaded was identified as the source of the error. I replaced the card in the meantime, but have not yet been able to gain any experience as to how reliably my eVscope is working now.
>> For details see page Unistellar eVscope.
First of all, the eVscope is a 4.5" Newtonian telescope (primary mirror diameter 112 mm, focal length 450 mm, aperture ratio f/4) on an Alt AZ GoTo mount. What is special about the eVscope, however, is that it should be able to show its owners images of sky objects that are reminiscent of photos taken with large or space telescopes (of course in a lower resolution, but at least in a similar fashion) and even in color. This is made possible by installing a camera chip at the location of the secondary mirror (which is discarded), and an electronic viewfinder built into the eyepiece. The telescope is easy to operate and works more or less fully automatically.
Experienced Kickstarter supporters, however, rather expected one or more years more to delivery than November 2018... Therefore, I decided to also buy a similar solution (which may be more flexible, but may also be much more cumbersome to install and operate) in order to get already an idea of the possibilities of the eVscope. But note that this solution is still much simpler than "true" astro photography. It is an Atik Infinity Color camera (it has a similar Sony chip as the eVscope, but the chip size is larger, and it is a CCD chip) that I put on my Sky-Watcher Star Discovery mount and primarily on my 6" Explorer 150PDS Newton tube (except for the camera, this is a "pure" Sky-Watcher solution...). However, after a busy "initial phase" I did no longer use the camera and mostly observed visually (and manually) instead...
>> For details see page Atik Infinity Colour Camera - Information.
After I had had very different experiences with the alignment of the Star Discovery mount and had seen with the eVscope that it can align itself automatically, I thought to further approximate my "preview configuration" to the eVscope and to supplement it with a Celestron StarSense module, which in the meantime was also available in a version for Sky-Watcher mounts. The entry into this world turned out to be absolutely "tricky" and frustrating "thanks" to the misleading manuals, and in the end the module still does not work satisfyingly for me... I was already decided to part with it again - but did not...
>> For details see page Celestron StarSense AutoAlign for Sky-Watcher Information.
The moon was certainly the sky object I had observed the most, but by then I had at best wandered a little along the moon surface and taken photos, mostly total views, of the moon. But what I exactly saw there, I did not know. Other astronomers, on the other hand, repeatedly reported how interesting they found the moon as an observation object. For me, however, it was rather a "troublemaker" that disturbed the observation of DSO. According to my astronomy dealer Mr. Kloß, however, there is actually almost always something to observe, provided that the sky is not completely overcast - and in such a case often only the moon comes into question.
Since "nothing comes from nothing," I decided to follow my DSO example and invest a little more time in the moon, as well. In the meantime, I have created a lot of Web pages about the moon, among them pages with photos of the moon phases, sections from moon photos, landscape forms, and a "moon alphabet." After that, the moon presented itself from its best side and had two total eclipses! Since then, I also find many objects visually that I was not able to find before - only later on photos. I have to admit, however, that despite my really intensive occupation with the moon, I always forget the crater names...
>> For details see page Walking the Moon with My Own Photos - Overview.
Due to changes in my astronomy equipment, my used Skymax-127 that I had bought at the end of 2017 no longer had suitable base. The far too small Mini Dobson base of the Heritage 100P had problems with the locking of the vertical axis: If I tightened the screw of the Mini Dobson base in a certain vertical position, the vertical axis still moved slowly further - and far too fast for observing or photographing, if higher magnifying eyepieces were used. In addition, during the total eclipse of the moon in July 2018, I noticed that my photo tripods had exactly the same issues. With one of my tripods, the vertical axis slipped even through and could not be locked any more, whenever the telescope tube pointed too high up.
I finally wanted to bring this misery to an end and asked my astronomy dealer Mr. Kloß for advice on simple azimuthal mounts. He recommended the Sky-Watcher AZ4 and the AZ Pronto mounts. I decided for the latter, because the Skymax-127 can be mounted with the viewfinder in a top position, even though the AZ Pronto, having a load capacity of up to 3 kg, is already overloaded with the Skymax-127. Like the AZ3 mount, it has flexible shafts for easy fine tuning of the two axes. The future will show whether the AZ Pronto is really overloaded with the Skymax-127, or whether this combination is "workable" - so far it looks like the latter to me.
>> For details see page Sky-Watcher AZ Pronto Mount Information.
First of all, this mount has become my "workhorse" for my smaller telescopes. I particularly like the operation with the two flexible shafts; I can even observe objects close to zenith (not necessarily comfortably...). If something disturbs me about this mount, it is the trembling that can sometimes make focusing time-consuming at high magnifications. This applies all the more to moon photos taken with the projection method. Here focusing gets really difficult, because there are also delays of the camera's electronic viewfinder in low light.
In September 2018, my wife and I visited the astronomy fair AME2018 in Villingen-Schwenningen (our first fair of this kind), and especially my wife noticed a "cute" Omegon refractor, which stood out in handling from other refractors - with its two focus rings it was more like a camera to operate. Having the long name Omegon Apochromatic Refractor Pro APO AP Photography Scope 72/432 ED OTA, this refractor tube is especially well suited for DSO rich-field observations, but also for the sun and the moon (it does not enlarge enough for planetary observations). It can also be used as a spotting scope (with Amici prism) and as a camera lens. After a long struggle, actually I did not want to buy a new telescope, we decided to order a sample - not without catching a cold from the seller, which prevented us from taking part in the wedding of one of my nieces afterwards. The refractor was delivered soon, so I could take it on holiday to France and test it there under a dark sky, where it proved itself quite well.
>> For details see page Omegon Photography Scope 72/432 ED OTA Information (2.8" Refractor).
On vacation, however, I did not like the focusing so much anymore, and I complained about it. I sent the telescope in for inspection, but got it back unchanged as being "within the norm."
Using the refractor, I was able to observe a lot of DSO, especially in autumn 2018, but also in winter 2018/19. Mostly I use the tube on the AZ Pronto mount (a photo tripod works also).
In December 2018, I directed my Sony RX10 M3 at the moon for the first time. With an equivalent focal length of 600 mm, the moon diameter is about 900 pixels in size. The camera does not resolve as well as my telescopes, but for many situations this is sufficient or can serve as a "backup," whenever there are issues with a telescope. I used it as a backup, for example, during the partial lunar eclipse in July 2019. In March 2019, I exchanged the RX10 M3 for a new M4 and continued the lunar photography with it. If you take a closer look at the photos, however, you can also see that the 1" sensor smears the details quite a bit compared to larger sensors...
Initiated by an inquiry of a star friend I found out that Sky-Watcher now only delivers their Star Discovery AZ GoTo mount with a WLAN module and without a handbox. This module can be retrofitted, and after initial dissuasion because of my Apple computer environment, my astronomy dealer Mr. Kloß gave me a module for "evaluation" in May 2019 (as a compensation he later got my cable-based SkyWire adapter). In fact, working with this module was a story of failure at the beginning. Gradually, however, I got the module to work (you cannot do certain things...) and I am also quite happy with the simplicity of the alignment and the accuracy of the module (which might make the Celestron StarAlign superfluous...).
>> For details see page Sky-Watcher Star Discovery AZ GoTo Mount - SynScan WLAN Information.
Now I have the choice between handbox, SynScan WLAN (with and without SkySafari) and StarSense (with and without SkySafari). Which solution will receive the preference, is still completely open for me...
Because of the often read praise, refractors, with which I had no experience at first, have enticed me to buy one again and again in recent years. Every time I found a somewhat cheaper refractor on the Internet, I called my astronomy dealer Mr. Kloß and asked for his opinion about the respective device. And he advised against it again and again because of the strong color errors, so that at first the purchase of a refractor simply did not happen. This changed in September 2018, when I came across the Omegon refractor PS 72/432 ED at the AME2018 astronomy fair in Villingen-Schwenningen and ordered one (see above). All in all, I am satisfied with it, but something bothered me: I was not able to find quite a few DSO even at the dark night sky in France. And so a suspicion germinated in me: An aperture of 72 mm might perhaps be a little small.
In my search for refractors with more aperture, I quickly was confronted with limits, especially financial ones. The only refractor with a large aperture that is inexpensive is the Sky-Watcher refractor AC 120/600 StarTravel OTA (or its Orion counterpart). But this is a refractor of the Fraunhofer type and is therefore often called a "paint bucket." In other words, despite an otherwise good optical quality, color fringes can be expected. So the question arose: How much do these color fringes disturb in practice and under what conditions are they still acceptable? You can only answer this question for yourself by testing the device. I decided to do this by buying the refractor, but not without asking my astronomy dealer again about this specific refractor (August 2019). In a telephone call he called the refractor inexpensive and, in view of its low price, also "worth considering." However, it is, according to him, too similar regarding the technical data to my Sky-Watcher Explorer 150PDS and would therefore compete with it. Thus, the wind was taken out of my sails, although I would have liked to take the refractor on vacation to France and test it there...
>> For details see page Sky-Watcher StarTravel 120/600 OTA Information (4.7" Refractor, Borrowed).
But not quite, because I know a hobby astronomer with whom I exchange e-mails and who owns such a refractor. I asked him about his opinion about the refractor, as well, and he offered to lend me the refractor for a while. He even allowed me to take it with me on vacation. I could not refuse this generous offer, the handover was exciting (beginning of September 2019), and I tested the refractor on vacation (I visited about 50 DSO there, including 20 new ones for me) - and also at home under various conditions.
After the test (I returned the ST120 in October 2019), I was about as smart as before: as everyone told me, I do not really need it, but at DSO it showed a good performance for me that was better than that of my PS72. In any case, this "borrowing experiment" was an interesting experience, but I will probably do nothing further in this direction...
After some "back and forth" in my telescope history, I was down to three telescopes in spring 2019, which complemented each other quite well: the refractor PS 72/432 was used for rich-field and DSO observations, especially on vacation, the Skymax-127, as a Mak with longer focal length, was good for observing the sun, the moon, and the planets - and maybe also for DSO observations, at least on vacation, and the Explorer 150 PDS tube was my "universal telescope," which is also suitable for "fast" astro photography with the Atik Infinity camera. I used the two small telescopes "manually" on the AZ-Proto mount, this is also possible during "stationary" holidays, and the large one (and the two small ones, of course, as well) only on the motor-driven Star Discovery mount.
Nevertheless, there was still no "peace" for me in this state, and when I found an advertisement for a 6" Cassegrain tube during my vacation, this seemed to me to be the ideal solution to further simplify my telescope collection and to replace both the Skymax-127 AND the Explorer 150PDS with this tube. This idea also opened my eyes to Schmidt-Cassegrain telescopes, which I had not considered before. It turned out that the Celestron C8 is thicker than the new 6" Cassegrain, but not heavier, and even slightly shorter! Maybe that would be another 8" aperture for me that I might still be able to handle!
A star friend who owns a C8 gave me the opportunity to "weigh" the C8 and try it out on my Star Discovery mount. A comparison between the C8 and my 6" Newton tube was, however, unfortunately prevented by upcoming clouds. So far everything seemed to fit. When I found a very reasonable price for the C8 at my astronomy dealer Mr. Kloß, I almost ordered it. But then I waited a little bit and consulted my star friend before I contacted Mr. Kloß. The 6" Cassegrain was quickly eliminated because, according to Mr. Kloß and some Internet sources, it is difficult to collimate and has to be collimated often, the C8 is much more "good natured" in this respect. And since Mr. Kloß was not able to talk me out of the C8 or buying a new one ("You buy a C8 used!"), I finally ordered it from him - after another reflection period, during which I was also looking for used C8s.
>> For details see page Celestron C8 OTA Information (8" Schmidt-Cassegrain).
On November 14, 2019, the C8 arrived at my home, and my first experiences with it are quite positive. I can see many sky objects easier and better than with small telescopes!
>> For details see page Sky-Watcher AZ4 Mount Information.
In mid-December 2019, I also purchased a Sky-Watcher AZ4 mount for observing manually with the C8.
Even after a the exchange iof my 6" Newton for a C8, I still longed for a refractor with pure colors, and I was also willing to spend a little more money for it (about 2000 EUR). When I wanted to reward myself for some "personal reason", the time had come for me to buy a refractor in July 2020. I chose some models and asked my astronomy dealer for his opinion on them. This time I, was "absolutely right" with a refractor from TS-Optics! I had however a more expensive, similar model in mind and wanted to buy this with a lighter focuser. First of all, according to my dealer, both tubes were identical, even if some Websites state slight differences, and secondly, a conversion to a lighter focuser did not seem possible, although TS-Optics advertises with it on its Website. There were also inconsistencies in the tube weights...
In the end, I decided for the device suggested by my dealer, the TLAPO1027 from TS-Optics. But all of a sudden, this device was no longer available from my dealer, and he did not receive a delivery of already promised devices either. After some back and forth, we postponed to "later" (in several months, how many, was unknown...). When I then went back to my dealer for another similar refractor, he advised me not to buy it, but he wrote that I should buy the TLAPO1027 if I would find it at another dealer, because "it is worth it". In fact, I bought it from another dealer who stated on his Website that he was able to deliver it within 1-4 days. But the dealer was probably not aware of the seriousness of the delivery situation. Astonishingly, after some back and forth he was able to deliver it (drop shipment from TS-Optics), because in some corner at TS-Optics a last sample could be found. That actually arrived at my home! However, someone must have taken the "drop shipment" too literally, because the "very stable aluminium case" was unfortunately damaged. . In the end, I will store and carry around the tube in a soft bag.
>> For details see page TS Optics Photoline 102/715 Information (4" Refractor)
In a first comparison day and night (M 3) the refractor showed itself clearly superior to my Omegon refractor PS 72/432.