In addition to the f-stop, it hs to do with the angle of the wedges
and the angle of the light coming in from the lens. I have no idea
what's being done today, but back in the Nikon F & F2 days, Nikon
made split image focusing screens for tele (and WA?) lenses in
addition to the regular ones.
Moose
And Olympus made their clear screens with microprism for different
focal lengths for similar reasons.
--
Winsor Crosby
Long Beach, California
?
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