Re:mismatched lenses

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Tue, 9 Sep 1997 
>From: P3D Dr. George A. Themelis asks:
>
>>Note that if you are using such a camera with the intention of scanning the
>>results, this resize step is very advisable especially for LCS viewing. The
>>mismatch will be more noticable in that environment than in it's original
>>slide form.  - Larry Berlin
>
>Why?  


It's the viewing geometry. With the images at full screen and being page
flipped so both occupy essentially the same space, such small mismatches
become noticable much more easily. I don't think most persons might notice
anything more than a slight discomfort and not know where it comes from. The
real point is that when I find and fix such mismatches, the image becomes
enormously easier to view. It's a subjective viewing and feeling thing.

I would guess that a slide projection viewed at an ideal ortho position
might have a similar quality. Traditionally what's on a slide is the way it
is. No easy way to fix it. In a slide viewer, the eyes are seeing separate
images through separate optics and any mismatch that small seems easier to
ignore than when the images are superimposed on the same viewing space.

In digital form, the image is easily fixed and since it makes so much
difference in viewing, it becomes important to fix it. My guess is that
fixing it in slides would have a similar benefit. It turns a marginal image
into a winning image, at least as far as ease of viewing is concerned.

The best and most viewable slides don't have this kind of mismatch. When it
does exist it can often be overlooked or ignored depending on the viewing
method. While freeviewing, I don't even notice much worse problems. When I
put a problem image into a viewing mode for LCS glasses, it sticks out like
a sore thumb by comparison. Worth fixing for sure.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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