01-12-2016, 08:02 PM
Quote:The Contax G lenses have no manual aperture.
I am referring to this one here:
<a class="bbc_url" href="http://www.bhphotovideo.com/c/product/1071788-REG/deo_tech_deocgsemkiii_contax_gto_sony_e.html">http://www.bhphotovideo.com/c/product/1071788-REG/deo_tech_deocgsemkiii_contax_gto_sony_e.html</a>
I had the mk2 version of that adapter but returned it because focus was not so accurate with the a7r.
I had the G21, G28, G35, and G45 in the past and the G90 is in front of my eyes now. I can assure you that the aperture is purely mechanical but with electronic contacts to provide EXIF.
Unfortunately, like many Leica M lenses, the Contax G lenses don't work that well on the Sony A7 series, except the G90.
G21 & G28 Biogons suffer from heavy color shift and corner smearing. I used them only with macro tubes.
G35 & G45 Planars are good from 5.6 onwards but at larger apertures, only the center was sharp.
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