Canon Community

I have a Canon control mount ring adapter programmed for aperture. After about 5 min with camera on the ring stops working. I have to twist off and on the lens or the mount to start working again. I have noticed that sometimes even if I do lens twist...

All, I am trying to dial in my 70-200 f2.8L IS II USM lens that I bought. I am not sure I am doing the right steps to get it razor sharp and may have some high expectations of lens/glass. Here is my current workflow and details. Mark 5D III body.I pu...