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P3D Re: Stretcho-TDC

  • From: Greg Erker <erker@xxxxxxxxxxxxxx>
  • Subject: P3D Re: Stretcho-TDC
  • Date: Tue, 9 Mar 1999 16:07:31 -0600
>2. How is it determined what's the best "ortho" seat in the house?  In other
>words, how do you calculate best viewing distance?  I have seen
>approximations of best seat = 2x or 3x the on-screen image height

  A realist image is about 20mm high. So if it
was taken with a 35mm lens the ortho seat will
be 35/20= 1.75 screen heights from the screen.

  If taken with a 50mm lens then the ortho seat
is 2.5 screen heights away.

  The projector lens FL doesn't affect where
the ortho seat is but obviously your projector
puts you further from the ortho seat than one
with a shorter FL (if you stand beside it).

Greg E.


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