Re: Auto-focus work with splitter attached?

[P3D <CJMCE@xxxxxxxxxxxxxxxx>]

The Nikon N-90 (I have a bunch of those) camera performs its autofocus by
measuring the chromatic abberation of un-focused images in the central portion
of the viewfinder.  By detecting the order of the colors, the camera's CPU
(central processing unit) then moves the focus motor one way rather than the 
other, resamples the color fringe, moves some more, etc.  

I would think that the autofocus would still work with a beamsplitter, but there
might be a bias in focus from one half-image to the other based on the exact
location of the autofocus sensor area to the beamsplitter edge.

If the beamsplitter contraption you have has any chromatic abberation itself;
you've got trouble...

Clifford J. Mugnier  (cjmce@xxxxxxx)
Topographic Engineering Laboratory
Department of Civil & Environmental Engineering
University of New Orleans
New Orleans, Louisiana  70148
Voice: (504) 280-7095
FAX:         280-7095


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End of PHOTO-3D Digest 1735
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