Steve Spencer Offline Upload & Sell: On
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johnctharp wrote:
DxO has the Canon as the sharper lens at all apertures, and as handling CA a bit better as well; it's also smaller, half the weight, and will have available AF (slow but accurate) and IS, and is half the price. On the balance, the Zeiss has a nine-bladed aperture versus the Canon's eight and significantly better handling and build, and the overall difference in sharpness and CA at DxO's test distance is almost negligible.
I'd say that it's a tossup, really. I'd personally love to own either or both lenses, but I'd have a hard time having to pick between them optically. From my perspective though, when used on the A7R, the significantly lighter weight of the Canon lens hanging off of the adapter and the intact IS (which is Canon's best) would seal the deal. The IS, in particular, really does mean not having to use a tripod so religiously for normal shutter speeds and would likely be ideal for getting the most of the 36MP sensor in the A7R....Show more →
I really didn't want to talk more about the limitations of DXOs tests, but I fell like I have to say a bit more. First, the DXO tests are relatively close up, which is not the type of shooting that it seems the OP wants to do. Second, the DXO tests do not measure the resolution of fine detail and that I think for the type of shooting the OP is looking to do is important--or at least it would be for me. Third, the distortion measure that DXO uses is not standard and can produce some weird results. It is bizarre that they chose that as a measure of distortion. Fourth, their CA measure is taken in exactly this situation in which CA matter least, when there is even and not too bright of light across the frame. It isn't much of a guide to CA performance either. If you can't tell, I am really not a fan of software based tests like DXO and Imatest. It is not that they provide no information, but rather the information that they provide is not very useful and yet people often mistake it for useful information. For what the OP wants to shoot I don't really think these tests provide any useful information.
By the way, right now on the A7r IS can be quite tricky to use. The shutter shake problems seem to be exacerbated by IS, or at least the advantages of IS are negated by the shutter shake. Until that issue is resolved I wouldn't count on IS to be much help.
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