Sigma SA lenses on A7/R through adapter
Mike Stratil wrote:
On Ebay I notice that Sigma SA to NEX adapters exist. I wonder how these adapters would work on my A7R. Given that Sigma SA is a crop format (relative to full frame), I assume that using such lenses as the Sigma 35mm 1.4 with such an adapter would result in vignetting.
Has anyone tried this combination? If so, what were your results?
I have one of these and it seems to work fine with my Sigma 70mm 2.8, for instance. The biggest problem is going to be aperture control. The adapter I have is dumb and doesn't provide any hook to adjust the aperture, so you're stuck wide-open unless the lens has an aperture ring. Most recent Sigmas do not.