Re: [photo-3d] Re: Silver screens

["Allan Griffin" <agriffin@xxxxxxxxxx>]

Michael Kaplan asked whether it was practical to paint roll-up screens with
silver paint.  Here is some comment from my experience:

Michael, you sure would get into difficulties if you don't use the right
kind of paint.  Your first challenge is to use paint which is designed to go
on flexible surfaces - like upholstery, for instance.

The next hurdle AND by far the most difficult, is to find and use a flexible
silver paint which is an ideal stereo screen paint.  By this I mean - a
paint that does not depolarise your image to an unacceptable degree.  There
is some trial and error testing involved here!!  In other words, I don't
believe that there is any easy fix.  The best fix, of course, is to find
someone who has done all this research and testing and use the same
material/brand.  I have been this way more than once.  I found what I
considered was exactly the right paint and it is so good that both my
current screens were sprayed professionally with it over 10 years ago.  Even
today, there is no need to consider a respray.

But, here is the downside:  I tried to buy some more of the material to help
out one or two friends.  I found that the manufacturer had been taken over
by a larger outfit and that this particular product had been dropped from
their list!

The right flexible paint can be applied to a lenticular roll-up screen which
might have had bad pola-extinction characteristics, for instance.  My larger
6 X 8 ft screen needed to be purchased from Da-Lite in smooth white plastic
and sprayed as above.  6 X 6 (70 X 70) was the largest Da-Lite available in
suitable silver for stereo projection at the time.   I would NOT advise
using any kind of textured material.  I find that the smoother, the better
for stereo.  If you go ahead, catch me off List as there will be an extra
tip or two.

Allan Griffin
Australian Rep. SD-PSA


 

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