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[photo-3d] Re: Sharpness vs. magnification
- From: Monte Ramstad <mramstad@xxxxxxxxxx>
- Subject: [photo-3d] Re: Sharpness vs. magnification
- Date: Sun, 15 Apr 2001 21:43:54 -0500
George wrote:
>I think you should change "field-of-view" to magnification.
I think that "field-of-view" more correctly describes the benefit
people seek. For example, binoculars having two lenses for
each eye can magnify an image, but they also cut the
view-of-view and therefore, not suitable as
stereoscopes (given the readily available alternatives). Also
on a computer, you can magnify an image while keeping the
window or field-of-view constant.
>Have in mind that magnification affects two things:
>1) The ability to see details. 2) The amount of stretch
>or squash in viewing. Ideally, the viewing distance
>should match the "recording distance". So one can
>"go off" both ways but practically it only happens
>one way.
Good points! I am considering creating a demonstration
of these effects on my website. However, I'm not sure
that the viewing distance should ideally match the recording
distance. Isn't this analogous to saying that in 2d photography,
one should ideally use normal magnification or else view
the image from the distance that the image was taken?
>When you view an image from far away and you lose the
>ability to see details, the stereo effect overpowers
>other qualities in the image. Stereo is in, photography
>is out. I think a lot of beginners are attracted to
>this situation because the stereo effect is something
>new to them.
I agree assuming the details are more visible at
close range than from far away. My point is that reducing
the viewing distance doesn't make more details visible on
a computer screen. In that case, is the increased field of view
worth the cost in sharpness?
I have to admit that attracting newcomers to stereo
photography has been a major interest mine. I'm not sure
but, I think it's rare for even very experienced people to
complain about stretch as long as the other factors of
presentation are OK.
Dr. Monte Ramstad
www.pokescope.com
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