How to focus with a Nikon type E focussing screen
I have a 'new' Nikon FM2n. It came with what I've just discovered is the type E focussing screen. Which was a bit of a shock, as I've only been used to the normal 'split screen' variety.
Any suggestions on how to focuss with this kind of screen? Are there any ways to confirm focus, other than guessing which bit looks the sharpest on the screen? The cross lines don't appear to do anything, other than help you keep the horizen level and so on.