Hello everyone, I've been looking for a focusing screen for my F2 photomic without much luck. I want the split image/microprism type. I've heard that F3 screens fit but I'm not sure how, or even if this is correct. So I have some questions. 1. Will a K screen for an F3 mount into the frame from an F2 screen and work OK? 2. If this does work will it be brighter and will it affect metering? I tried my F3 screen loosely in my F2 and it appeared to be OK but I really need someone to tell me if it's going to work or not. Thanks in advance. Ed.