Originally posted by KiloHotelphoto Also the gains for wildlife and telephoto lenses on mirrorless is huge, animal eye AF is incredible.
I'm talking in terms of optics - which is the only thing that really matters when all is said and done. With telephoto lenses optical compromises are negligible considering the flange distance of most DSLRs was shorter than 50mm. With flange distances of 30mm and shorter a 500mm f/4 lens with a standard design is only going to be
fractionally smaller and lighter than a DSLR lens with the same design parameters.
The only advantage in going mirroless isn't eye AF* it's the shorter backfocus that makes things easier for lens designers to make fast wide angle lenses. That's it. Eye AF could be incorporated into a DSLR if manufacturers put the R&D into it, Nikon's 3D Tracking mode as used in the D4~D6 is already on that path.
*that's a mere reflection of modern technology and software development.