T3D Re: stereo math

[erker@xxxxxxxxxxxxxx (Greg Erker)]

>Mannle held that the viewing
>distance was irrelevant to the first order and I think it is indeed a
>weaker effect but we won't know how weak until someone does experiments.

  I had some medium format hyper stereo shots
with too much on-film-deviation (perhaps 10 or more
mm vs the "correct" 2.7)

  With my glasses removed (-4 diopter prescription)
I can view from about 250mm away and was easily able
to fuse the full stereo images.

  But viewing the slide in my viewer (with 82mm)
lenses I was unable to fuse the too-near objects.

Just my experience - Greg E.



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