« on: December 23, 2012, 01:40:06 AM »
Hard stop on a manual lens is not so bad, but it WILL be affected by temperature. Hard stop on an AF lens is not so good. The focus motor will be ramming up against that stop every time focus is at infinity or the lens runs to infinity while trying to focus. It needs to have a bit of overtravel, i.e., go a bit past focus and then come back to it. What I do is make a mental note of where the line/arrow/whatever is in relation to the infinity mark when AF is at infinity. If I need to set it manually (night shots, astrophotos, because I want to, etc.) that's where I set the focus.