Samuli Vahonen Offline Upload & Sell: Off
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I find G21 technically very strong, DOF is ultra thin compared to all retrofocus 20-21mm lenses I have ever shoot, while boke is also good. On landscapes it's also very good. As I don't have A7r mkII I don't know how color casts on edges work with that, but with A7, A7r and A7mkII this lens needs FlatField plugin for every photo.
I have shoot the lens with standard cameras (1500mm PCX reversed) and Kolari v2 modified cameras (2000mm PCX). I like it more on Kolari v2, due to better suitability for boke-shooting. For landscapes both seem similar (and unlike nehemiahphoto I have no complain on "technical" side, my copy of G21 with front filters is very sharp and contrast very high).
I had it with me on summer holiday, but I have not yet processed the photos. So I only found 7 photos, shoot during trying to understand the front filter performance, before the summer - I think I have posted all of these in FE thread, at least majority of them:
Carl Zeiss Biogon T* 2.8/21 G @ f/8.0, 1/15s, A7mkII @ ISO 160, OptoSigma SLB-50-1500PM Reversed (I may have used some polarizer as well, not sure - FlatField plugin was not used, should have but didn't)
Carl Zeiss Biogon T* 2.8/21 G @ f/5.6, 1/100s, A7mkII @ ISO 125, OptoSigma SLB-50-1500PM Reversed (FlatField was also not used for this)
Carl Zeiss Biogon T* 2.8/21 G @ f/11.0, 1/640s, A7mkII @ ISO 200, OptoSigma SLB-50-1500PM Reversed (FlatField plugin was used)
Carl Zeiss Biogon T* 2.8/21 G @ f/2.8, 1/640s, A7mkII @ ISO 80, OptoSigma SLB-50-1500PM Reversed (FlatField was used)
Carl Zeiss Biogon T* 2.8/21 G @ f/4.0, 1/640s, A7mkII @ ISO 100, OptoSigma SLB-50-1500PM Reversed (FlatField plugin was used)
Carl Zeiss Biogon T* 2.8/21 G @ f/2.8, 1/200s, A7 (Kolari v2) @ ISO 80, OptoSigma SLB-50-2000PM (This in on Kolari v2 modified camera using 2000mm PCX - I still can't believe how good this lens is with this camera and front filter, I don't know any ultrawide which can have this kind of DOF-separation and boke quality, this kind of performance is the reason why G21 has become my favorite ultrawide of all times. FlatField plugin was used)
Carl Zeiss Biogon T* 2.8/21 G @ f/2.8, 1/80s, A7 (Kolari v2) @ ISO 80, OptoSigma SLB-50-2000PM (Again with this combo boke/separation is something I find hard to believe this is ultrawide lens. FlatField plugin was used.)
Samuli
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