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P3D Projector question!

I currently am using a Viewmaster Stereomatic 500 but have now switched to the 
Realist system.  I was just wondering:  In order to fill my 50" screen with my VM 
projector, I have to have the projector quite a distance away from the screen.  Could 
anyone tell me how many feet away a TDC 116 or 716 has to be to fill a 50" screen?  I 
am assuming that it has the standard 5" lenses.  How much better do the 4" lenses do? 
 Thanks, Ron Short  rshort@xxxxxxxxxxxxxxxx  :-)



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