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Re: [OM] 3D (What worked, what didn't)

Subject: Re: [OM] 3D (What worked, what didn't)
From: "DrT \(George Themelis\)" <drt-3d@xxxxxxx>
Date: Wed, 5 Aug 2009 12:01:13 -0400
> It seems possible (though it doesn't make sense to me) that a shift
> lens indeed works, [...] I  thought the very basis of stereo
> is to have two  physically different points of view, e.g. like our eyes
> are separated.  With a shift lens, the camera is stationary, so the point 
> of view is the same, is it not?

No, it is not.

It is the lens that determines the point of view, not the camera.  The 
camera just holds the film/sensor where the image is recorded.  As a matter 
of fact, a stereo camera has two lenses and one camera body.

The person whose picture you linked:
http://www.flickr.com/photos/turbguy/2332656395/
is a member of our stereo club here in Ohio, but recently relocated.

The description reads:  "Here's a cross view of a macro photograph taken 
with a shifted lens and a shifted camera (slide bar) to avoid keystone 
distrortion yet obtain a full field view. "

He combined the shift lens and a shifted camera in order to "obtain a full 
field of view".  It takes some knowlege and experience to understand what 
this means.  When you take a close up by shifting the camera, you need to 
crop the outer edges of the stereo pair, in order to "set the stereo window" 
(helps in the presentation).  This is not a problem in digital but it can be 
a problem with slide film. Cropping the edges results in a smaller image.

This fellow combined the shift of the camera with the shift of the lens, to 
reduce the need of cropping.  The exact details are not clear to me. I know 
that if you shift the camera and *tilt* (not shift) the lens (or camera), 
then you don't need to crop.

These are details that don't need to confuse the beginner... The simplest 
way to take a stereo picture is to shift one camera (with lens attached :)). 
If you have a shift lens, apparently shifting the lens between the two 
extremes right and left, will work too, but the "stereo base" might be less 
than optimum for anything other than extreme close ups.

George 

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