P3D Re: Stereo Projectors

[michaelk@xxxxxxxxxxx (Michael Kersenbrock)]

> Michael Kersenbrock wrote:
> > Rather than try to bolt two $20 projectors together with probably
> > a LOT of work and uncertain outcome, another possiblity is to just
> > use two of those $20 projectors for 2x2x2 projection!  Just get those
> > two projectors and a couple pieces of polarizing material to jury-rig
> > out in front of the projector's lenses and you're in business!
> 
> Well, you seem to have really different slide projector brands in the
> USA than in Germany. I'd like to buy a second projector for stereo shows
> - but my photo dealer told me that only with the most expensive brands
> it would be garanteed that both lenses have exactly 90mm. Otherwise it
> would be impossible for the brain to make one 3D picture out of the two
> pictures.

Well, with the very cheap projectors (actually they can be had for quite
a bit under $20 at garage or estate sales) one can just buy several just
for the lenses.  :-)

But then, with separate cheap projectors, can't one just put the one
with slightly longer F.L. a hair further back than the other one to
compensate for the magnification difference?  Doesn't seem like it'd
be much, and it seems like it'd be easy to match with no slides in
them (assuming they were the same model).

> Also he showed me a special silver screen without any surface protection
> and said that other screens would depolarize some of the light.
> This special screen was about $150 per m^2 and every contact with it
> destroyed parts of the surface. Not very nice...

One can get new silver screens in the U.S. from B&H (or at least could,
haven't checked lately) quite inexpensively.  I think my 50-inch diagonal
screen was about $60 new, and I've a secondary 40-inch silver screen that
I got for effectively nothing as part of a package deal with some things
I really wanted (at an estate sale, late when things were cheaper).  So
getting one used from "back in the days when they were popular" could be
a way.

Mike K.

P.S. - I've an old Kodak carousel projector and a  Zeiss-ikon projector that
       I plan to try projecting 2x2x2's with (now that I have some to
       try (thanks Boris!)).  Not $20 projectors but not Ektagraphics
       either.  :-)


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