turp77 wrote:
I don’t see what is the problem is with how you wrote your question, it’s very clear. To answer your question. I have 5 canons and a lot of Nikons and never had this happen to me. I have changed many focus screens or removed them for cleaning. Could be it wasn’t fully locked in from the beginning. I think you were visited by Mr Murphy🙂
He indicated later that it might have been user error when he quickly mounted a lens during a shoot. And yes, his original question was very clear.