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
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).
Photo: Body with A12 M-mount expansion unit attached and Zeiss Biogon 35mm f/2.8 lens
|Focal length||35 mm (52.5 mm equiv.)|
|Angle of view (35mm film)||62° diagonal|
|Number of iris blades||10|
|Number of lenses/groups||7/5|
|Shortest distance||0.7 m|
|Length (with cap)||55 mm|
|Maximum diameter||52 mm|
|Filter thread||43 mm|
|Lens hood||does not have one|
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.