P3D Re: Stereo Projectors

[=?UNKNOWN-8BIT?Q? "R=FCdiger?= Pein" <pein@xxxxxxxxxxxxxxxxxxxxxxxxx>]

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.
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...
Does anyone have other, cheaper, more tricky solutions?
And if I understood the polarizer discussion correctly: Can I only use
linear polarizers for my projectors, can I also use circular ones, or
can I use circular ones only in one direction?

Thank you,

Rždiger Pein

PS: The slide projector I already have is a Kindermann silent 2500, and
I'd like to buy a Kindermann 2500 silent select S (I'll also use it for
conventional slide shows, and it's already the maximum of what I can
afford).

-- 
Rždiger Pein, Alfred-Drexel-Str. 1, D-80992 Mžnchen
Tel: +49-89-14 95 96 18           mailto:ruede@xxxx
Fax: +49-89-6661-751508           http://i.am/ruede



------------------------------