P3D RE: Re: Your letter 3rd Jan, 3D Screen

[Ian Sim <iansim@xxxxxxxxxxxxxxxx>]

Dear Lawrence.  The Netherlands screen was indeed our Spectral 2000
material, it is likely  that a UK congress would have used one of our
surfaces but I cannot be
certain of that.  On increasingly rare occasions we manufacture a screen

known as T32, this is a highly directional 3D silver screen - it may be
that
this was the one used in the earlier congress.  Spectral 2000 does have
a fall off as you will see in the gain curve  included within the
literature pack.  With a 5degree off axis gain of around  2.1 the figure
reduces to around 1.4 at 15 degrees.  Trust the above is helpful to
you.  Regards  Ian Sim

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From:   Lawrence A. Haines
Sent:   12 January 1998 10:56
To:     Ian Sim (iansim@xxxxxxxxxxxxxxxx)
Subject: P3D Re: Your letter 3rd Jan, 3D Screen
Ian Smith:

Thank you very much for responding to my inquiry on your screens.  I
assume
from your comment on the Stereo Congress in Netherlands, that your
Spectral
2000 material was indeed the material of the screen used there.  Was
this
the same material used in the previous congress in the UK?  The reason
that
I ask is that William Duggan of the  Photographic Society of America
(the
man responsible for helping others with screens) indicated that the
screen used in the UK had significant drop off at angles greater than 15
degrees from the centerline of projection, and some ghosting..  Since I
deliberately looked for both of those things in
Netherlands and did not seem to find the same thing, I am a little
confused.  Thanks also for sending a sample and some literature.  I
await these with anticipation.  I will hold further questions until I
have had an opportunity to see these things.  It feels good to be
finally in contact with someone from Harkness.  Thank you.     Larry
Haines