Re: report on Freeviewer's Assistant

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 9:15 PM -0800 11/7/97, P3D Dr. George A. Themelis wrote:
>
>"Alan touches on two issues of interest to theoreticians :):  Isn't the
>magnification larger in the unaided eye because of the shorter light path?
>Isn't there keystoning present due to use of mirrors?  The answer is YES to
>both questions but the effects are negligible from a practical point of
>view.  They both might be more noticeable the closer you get to the image
>but they are not a problem at normal viewing distances (at the stop
>location of the pivoting mirror)."
>

Re magnification, it's kind of interesting; horizontal and vertical
magnifications of one image both have perceptual consequences, but they go
in opposite directions & roughly cancel.  So even if the differential
magnification is perceptible when the two images are viewed separately,
when fused it shouldn't matter (provided the images can still be fused, of
course).

-Jim C.

----------------------
Jim Crowell
Caltech Division of Biology
216-76
Pasadena, CA 91125
Tel: (818) 395-8337
Fax: (818) 795-2397
jim@xxxxxxxxxxxxxxx



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