Ricoh GXR: M-Mount Unit with Zeiss 35 mm

Expanding the Equipment | Body with Lens Attached | Some Technical Data | Sample Images | Conclusions | Links


After Ricoh's official announcement of the M-mount expansion unit, I decided to buy one, although I had not intended to do so originally. Here are my first personal experiences with the lenses that I bought (or tried to buy). This page is devoted to the Zeiss Biogon 35mm f/2.8 lens.

All lens pages: Voigtländer 15mm f/4.5 | Zeiss Biogon 21mm f/4.5 | Voigtländer 25mm f/4 (M39) | Minolta M-Rokkor 28mm f/2.8 | Zeiss Biogon 35mm f/2.8 | Zeiss Sonnar 50mm f/1.5 | Voigtländer 75mm f/2.5 (M39) | Leitz Elmar-C 90mm f/4 | Leitz Tele-Elmar 135mm f/4


Expanding the Equipment

After I had acquired the M-mount expansion unit in mid-October 2011, I decided to also expand my range of lenses into focal lengths that I already own in the form of A12 camera units. This was caused by the observation that I was too lazy to exchange units. Exchanging lenses only seemed much simpler and also simplifies the equipment that I carry around with me.

This decision turned out to become a very expensive one, because both of the Voigtländer lenses that I bought, a Voigtländer Color Skopar Pancake II 1:2.5/35 mm and a Voigtländer Color Skopar Pancake II 1:4/21 mm, were decentered. So I sent them back (the 35 mm lens even twice) and eventually bought the equivalent Zeiss Biogon lenses, a Zeiss Biogon T* C 21mm f/4.5 lens and a Zeiss Biogon T* C 35mm f/2.8lens, at a much higher cost. The Zeiss 35 mm lens is a little bit slower (f/2.8 versus f/2.5), heavier, and much more expensive than the respective Voigtländer pancake lens.

Here is the story of the two Voigtländer lenses that I bought initially. And here is my Zeiss Biogon T* C 35mm f/2.8 lens that replaced the Voigtländer 35 mm pancake lens:


Photos: Arrived on November 22, 2011 as a replacement for a Voigtänder lens: Zeiss Biogon T* C 35mm f/2.8 ZM lens (black) (52.5 mm equiv.)

On the M-mount expansion unit, this lens has an equivalent focal length of 52.5 mm and thus, works like a normal normal lens (in between a 50 mm and a 55 mm normal lens).


Body with Lens Attached

Photo: Body with A12 M-mount expansion unit attached and Zeiss Biogon 35mm f/2.8 lens


Some Technical Data

Focal length 35 mm (52.5 mm equiv.)
Angle of view (35mm film) 62° diagonal
Maximum aperture 2.8
f-stop range 2.8-22
Number of iris blades 10
Number of lenses/groups 7/5
Shortest distance 0.7 m
Weight 200 g
Length (with cap) 55 mm
Maximum diameter 52 mm
Filter thread 43 mm
Lens hood does not have one


Sample Images

Here are some samples taken with the Zeiss Biogon 35mm f/2.8 lens (click the images to view the unprocessed original files in a new window):




Disclaimer: I am not a lens expert who sees marked differences between various Leica and/or other lenses. I can check for soft corners, find differences in color rendition, and, in rare cases, may discover a "3D look", but that's all. Please regard therefore my conclusions as the verdict of a "layman".

As far as I can see, the results that my Zeiss Biogon T* C 1:2.8/35 mm lens produces with the M-mount unit are very pleasing.



For more links related to the Ricoh GXR M-mount expansion unit, see page M-Mount Links.


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