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Re: Fresnel lens image

I think that Wolfgang has it right. Kodak has come a long way from
their first static, 3-D images that they made back in the '60's. My
dad had friends at the Tennessee Eastman Kodak location and we had
some 'sample' images made with their truck mounted camera. (Even one
that the Pope sat for in the Vatican!)

The ridges of plastic ran vertically across the image(s). I could
count only five distinct 'frames' in these early shots. Current ones
are WAY more spectacular. (see the Kodak site). Instead of 'slicing'
a set of photos, a collection of lens is used and the film is covered
by a 'complementary' set of refracting lenses. I'm sure there is some
great optics involved here.


At 3:57 PM -0700 4/23/01, Larry Woolf, you wrote about Re: Fresnel lens image:


Take a look at the following site for some information
http://www.kodak.com/US/en/motion/dynamic/index.shtml

Dr. Lawrence D. Woolf; General Atomics, 3550 General Atomics Court, San
Diego, CA 92121; Ph: 858-455-447; www.sci-ed-ga.org


Subject: Re: Fresnel lens image


If you can actually grossly feel and see these parallel grooves, then it
cannot possibly be a diffraction effect -- for diffraction effects, you
need parallel grooves that are spaced at least of the order of 1000 per
inch, but the closer the better. What you have is more likely a refraction
effect -- probably a triangular shaped groove in the plastic that lets you
see one image when viewing through one face (side of the goove) and another
image when looking through the other. I imagine the pictures underneath
must be sliced at the same spacing as the grooves and overlapped by
alternating the slices? Just my guess. Wolfgang

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