> Okay, if we're talking about, for instance, my RB-67 and using the
> eye-level prism finder, in acuality, you're just looking in a little
> window, through a prism, and at the very same piece of groundglass
> you look at when using the waistlevel finder, except now you can only
> see it with one eye. What about that could possibly make it brighter?
> It appears the same size, and, in fact, since there's more glass
> involved, it's probably a little dimmer.
So the ground-glass focus screen in a 120mm camera is also larger than
in a 35mm screen, right? (it must be, or the mirror would have to be
curved to shrink the image down, I guess).
And so the light-per-area on the focus screen is thus the same as that
on a 35mm screen, and there's more focus screen area -- but because the
entire camera is physically larger, my eye has to be further from the
screen on a 120mm camera than it is from a 35mm screen, so because of
distance falloff the final percieved result is the same. (and I guess
the eye relief lenses don't make any difference here; they just change
where I need to focus my eyes to see it, the amount of light is the same).
I think that makes sense..
-- dan
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