RE: testing auto focus on birds

I was running that Helios setup earlier at a festival and it was wonderful using the manual focus in such a lively location after using AF on a 35mm 1.8.

I've been looking at getting the a6700 to update, I was really on the fence of sticking with APS-C but I wouldn't mind it for video commercial jobs, especially with the vintage lenses or some consumer priced APS-C cine lenses like the Sirui ones