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
John Hermanson wrote:
Half circle (split image) goes dark on all focus screens of that type unless
it's made by Canon. They found a way to make split image screens that don't
black out below f4.5 (or whatever the f is).
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