Focusing Aids

Bahtinov Mask | "easy-sharp" Focusing Mask | Bahtinov Mask for the eVscope | Links

Both with my Atik Infinity camera and when photographing with the projection method, I have problems with focusing the telescope reliably. I therefore bought two focusing aids on the AME2018 astronomy fair in Villingen-Schwennigen, Germany: a Bahtinov mask from Lacerta and an "Easy-sharp" focusing mask from noctutec.

Note: I cannot report any experiences here, because I never used these masks in practice and sold them together with the Explorer 150 PDS in early 2020.

However, with the eVscope that I received at the end of January 2020, I got a Bahtinov mask, which is inserted into the tube cap for storage. I will briefly introduce it at the end of this page.

 

Bahtinov Mask

Photo: Bahtinov mask (Lacerta, for 150 mm aperture), delivered with 3 clamps

From the product description (from Astrogarten, translated):

How to use the mask (from Astrogarten, translated):

A photo of what a correct setting looks like can be found on the product page on the Astrogarten Website (author: Nils Kloth).

At my first attempt with this mask I saw the "spikes", although not always evenly bright. The focusing with the Bahtinov mask seems to have worked to some extent. But this was just a short test on the eyepiece. The "easy-sharp" mask, which I also tested, seemed to be more "stable" and easier to adjust.

Note: I cannot report any experiences with the mask, because I never used it in practice and sold it together with the Explorer 150 PDS in early 2020.

 

"easy-sharp" Focusing Mask

Photo: "easy-sharp" mask (noctutec, for 150 mm aperture)

Description (from noctutec, translated):

Procedure (from noctutec, translated):

Photos of how to approach a correct focus can be found on the product page of the noctutec Website (provided by the Volkssternwarte Köln).

At a first attempt with this mask, I saw the above-mentioned three stars offset by 120°, and also how they superimposed. Focusing with the "easy-sharp" mask seems to have worked. But I cannot remember the 6 spikes anymore... Anyway, this was just a short test on the eyepiece. The "easy-sharp" mask seemed to be more "stable" and easier to adjust than the Bahtinov mask, which I also tested. That is what the advertising claims!

By the way, the mask was too tight to fit into the tube of my Explorer 150PDS. That is why I temporarily held it by hand. This was announced to me by the dealer when I bough the mask.

Note: I cannot report any experiences with the mask, because I never used it in practice and sold it together with the Explorer 150 PDS in early 2020.

 

Bahtinov Mask for the eVscope

Below, I present some photos of the Bahtinov mask for the eVscope. For storage it can be inserted into the tube cap. When in use, it is inserted alone into the tube.

         

Bahtinov-Maske in den Tubusdeckel eingesetzt

 

Bahtinov-Maske entnommen, Rückseite

 

Bahtinov-Maske entnommen, Vorderseite

   

Bahtinov-Maske auf dem Tubus, vorn der Tubusdeckel

 

Links

 

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02.02.2020