> When you are looking through the
> viewfinder of an SLR camera you are actually viewing a
> back-lighted picture exactly 2 meters away from your eye.
>
> Corrective Diopters are nothing more than "contact lenses" or
> "glasses" to correct a person's vision for the 2 meter distance.
So just to make sure I'm understanding this correctly:
If I take my glasses off, things at 2m are blurry -- so I won't be able to
focus on the screen in my camera, so I'll have a hard time getting things in
focus because even if the lens is correctly set up, I'll still see a blurry
version of a sharp image.
If I wear glasses, things at 2m are in focus, everything is happy -- sharp
image on the screen = sharp image on the film.
Now, what I don't understand is why, when I'm doing macro photos, I have a
_devil_ of a time focussing on the screen. If I'm photographing something a
long way away, I can look "through" the screen, and if I get my eyes to
focus at infinity, everything is sharp -- the speed display is okay, the
image is crisp, all is well.
If I'm photoing a flower from a foot away, I have a lot more trouble
getting my eyes to "click" into focus on the screen. Why is this? Surely if
the screen is "2m away" it shouldn't make any difference what I'm projecting
onto that screen?
-- dan
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