>>2903619I've used a 2 year old Sigma Art lense on all of my EOS bodies, works just fine.
I think your main worry is "forwards" compatibility, not backwards compatibility, and I don't think anon is in the market for a 5DSR.
>>2902294>The only exception is that you cannot mount a modern EF-S lens on any full frame body, film or digitalThe EF-S 10-22mm goes on all of my film bodies just fine too, with the plastic baffle on the back popped off.
FF coverage from 13mm.
>The EOS 3 is more expensive but is the pinnacle of modern 35mm SLR designNope.
For that you want the 30V. The final film body designed by Canon, the only one with E-TTL-II, the most silent film advance, rewind and shutter of all of them, as well as eye control AF in any camera orientation and 4FPS continous drive.
Available for a pittance because people are morons.
