P screen is very useful. Standard original A screen works great for pictures of people, vertical things like a tree (trunk). I have no great insight, but when I was a kid with a new F2S, first thing I bought was a P screen, just like the astronauts
Of course I tried to use it with a 55mm f3.5 micro-Nikkor, not the best combination, dim lenses and microprism.
When I was 16 I was a complete idiot, but I had a Nikon!
(I know some people think I still am a complete idiot, probably right
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