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p.1 #9 · p.1 #9 · Zeiss ZM 21/4.5 biogon vs 38/4.5 Biogon (SWC) | |
I found these: http://www.pbase.com/dierk/leica_m_monochrom
Would be worthwhile contacting him for his opinion.
I was able to test the C-Biogon on the M9 when I first got the camera back in 2010... not sure if I still have the test photos anywhere. At the time I wanted to see how bad it really was, compared to the other ZM21.
From what I recall, it was very sharp, but colour shift and vignetting was severe. By f/5.6 it was difficult to tell the two lenses apart (for sharpness), though I think the C-Biogon had a slight advantage and much less distortion. But I went with the ZM21/2.8 because I shoot mostly colour and needed the lens speed in consideration of the M9's higher ISO performance.
My instinct is to say on the MM the C-Biogon will be sharp, but will likely have strong vignetting. I'm not sure whether the lack of CFA on the MM's sensor will make any significant difference to the amount of vignetting...
I think the appeal of the C-Biogon is the combination of size, performance and price. If you're willing to spend a bit more, I feel Leica's 21 SEM is a performance match for the C-Biogon, except distortion, which could be fixed in post, if you're not opposed to doing so.
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