P3D Re: slide projection

["Dr. George A. Themelis" <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Relax, don't worry, everything will be fine, relax..... :-)

1. mounting for projection
2. horizontal, vertical and rotational factors in relation to projection
3. keystone-ing the screen
4. ortho positioning for viewing
5. polarization filters and glasses
6. depth rations for projection- shooting pictures with that in mind

1. No different than mounting for viewer.

2. Vertical and rotational ERRORS should be avoided.  Use of good mounting
   materials might make a difference.  Mounting experience is developed with
   time and PRACTICE.  There are a few mounting guides around.  The rest
   is practice that results in experience.  RBT mounts might be the easiest
   to use for accurate stereo projection. 

3. Since the screen is usually raised above projector and audience level,
   "keystoning" the screen is desirable.  The better quality screens allow
   you to tilt them down.  Tilt the screen so that the projector is pointing
   at a right angle at the screen.

4. It does not matter.  Put the chairs around the center of the screen.
   Some seats (usually the closest to the screen) will be more ortho
   than the rest but it should not worry you.

5. Not a problem.  Check with Ron Labbe or Reel 3-D for supplies.  Get
   the best pair for yourself and the cheapest for your audience :-).  If 
   the audience is small and you have money to invest, get luxury glasses 
   for everyone.

6. Again, no serious problem.  The guidelines are set for both viewer and
   projection.  Avoid more than 1.2 mm on-film deviation.  Using a Realist
   format camera that usually means, do not try to include close up 
   objects (less than 7 ft) and infinity at the same picture.

For a small audience (50 or less) the 70 in. screen is fine.  Adjust the
projector so that the screen is filled up with a 7p image and the stereo
window is at the screen.

There is no reason for anxiety or worries in projection as long as you 
have been doing a decent job mounting your slides for viewing in a viewer.

-- George Themelis


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