P3D Re: silver screens & Reel 3d Webb

[WDuggan3D <WDuggan3D@xxxxxxx>]

The NEW and correct website address for Reel 3d is:
www.stereoscopy.com/reel3d  so please delete the
wrong (old) webbsite I previously gave.

I think that Reel 3d also has polarizers for the TDC Project-or-view
as well as instruction manuals for VM, TDC, P-or-View projectors.

The 84" high DA-LITE SUPER-WONDER-LITE silver lenticular
screens I had made up for NSA and PSA and myself are from
the only 84" wide roll ever made by DA-LITE, which Guy Ventouillac 
and I purchased in the mid-80's, and which is no longer in production,
and no longer available.  It would appear that there were production
 problems with this wider material with the ribs perpendicular to the
 length of the roll (instead pf parallel with the length of the roll).

PSA still owns an original STEREO-REALIST flat silver screen,
9 feet by 9 feet, which fits on the frame with snaps, but it is wearing 
out.  As it is a flat screen, the range of brightness is only 15 degrees
on either side if the center axis of projection for a total brightness area
of only 30 degrees, and it hotspots in the middle.  Neither snaps nor 
velcro works well with silver screens, whether flat or lenticular, as the
material expands and contracts with temperature and humidity 
changes, but does not stretch.  The material may shrink so much that
it is difficult or impossible to get the snaps to fit, or it may expand, in
which case it is loose with no way to tension the material.  The best 
method for fastening the screen to a frame is to use plastic fastners 
to fasten stretch cord around the perimeter of the frame with "S" hooks
that can be stretched to hook into grommet holes around the border of 
the screen, thallowing the stretch cord to tension the screen perfectly.

Stereoscopically Yours, William A. DUGGAN, APSA


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