~~NoMad~~ <> wrote:
>
> It would be interesting to figure out what the effective resolution of an
> eye looking through an SLR viewfinder is. What with all the optics and
> focusing screens in the way, I would suspect it would be quite low.
>
I doubt it. The ground glass collar on my old Pentax
viewfinder screen is sharp enough that a 2x magnifier
over the eyepiece is genuinely useful. I would
guess that that means a resolution on the fine
ground-glass portion of the screen of better
than 1 line pair per minute of arc.
The viewfinder is around 20 degrees by 30 degrees,
so a whole screen with 2 pixels per minute of arc would
have to be over 8 megapixels.
That being said, an 8 megapixel EVF would be in
many ways better than an optical system. The
really sharp area would not be confined to
a doughnut shape at the centre of the screen,
and it could be as bright as you like.
Peter.
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