C-Biogon 21/4.5 on M11

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56 minutes ago, MarshHow said:

HI! I recently bought my first digital Leica camera body, M11 and looking for the compact 21mm lens. The C-Biogon 35/2.8 is my first M mount lens and really love it. I wonder if the 21/4.5 mounted in M11 will experience corner inferior(softness not color shifting) 

I an not good at comparing lenses of different focal lengths but at the same aperture, no 21mm lens i'm aware of can compete with the Biogon 35/2.8 as far as corner rendition is concerned, besides the Summilux 21/1.4 perhaps but i have no experience with it.  To compare apples to apples at f/4.5, the Biogon 21/4.5 looks sharper at corners than both S-A 21/3.4 and S-A 21/4 but softer than SEM 21/3.4 or CV 21/4.

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I will say the Leica 21mm/3.4 Super-Elmar ASPH is a fantastic lens, but it's larger (though not big, in the scheme of things) and much more expensive than the Zeiss 21mm/4.5. I have not used it much on the M11. I did break it out  the other day at work to photograph the light microscopy facility for a presentation on laser safety we are woking on. I had a Leica Super-Angulon 21mm/3.4 years ago, and used it on M6 and M7 film cameras. It was OK, but not nearly as good as the Super-Elmar, and would probably be bad on digital sensors as the rear element would be so close to the sensor plane. I imagine that would cause a lot of image smearing, but I am guessing.

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Both S-A 21/3.4 and ZM 21/4.5 are character lenses indeed. Not sure i would compare them to the SEM but the latter has more distortion and its MFD is only 0.7m vs 0.4m for the S-A and 0.5M for the Biogon. I like much the SEM though but I have a soft spot for the Biogon TBH. BTW the M11 has a BSI sensor that works fine with the S-A 21/3.4 too. FWIW.