Projection

[P3D Bob Aldridge <bob.aldridge@xxxxxx>]

John B posted:

->Paul T writes:
-> 
->> As usual, I can't begin to keep up with John's insightful
->> analysis.  :(  But I want to ask a question anyway.  ;)
-> 
->If you can't, I screwed up and I apologize.  8-(  I'm certainly
->willing to expand on any section you'd like.
-> 
->> As Bob Aldridge noted (but disagreed with) most projectionists
->> adjust the projector so that the window is at the screen.
->> But in the 4200mm image height example, you seem to be saying
->> that the window is 4200mm in front of the screen.  (6300mm
->> viewer to screen distance, minus 2100mm viewer to window distance).
-> 
->I think, to be more exact, Bob wants to put the window at the proper 
->distance regardless of where the screen is.  You can do this if the 
->room is dark.  What Bob specifically doesn't want to do is put the 
->window at the screen when the screen is 50 feet square! 

<<Explanation snipped>>

-> 
->I'll try to think of how to say this stuff more clearly and post
->again.  (What's that groaning sound?)

I shouldn't bother trying to make it any clearer - you've set down
perfectly what I was trying to explain - and you're absolutely right
about the blackout! 

The room MUST be totally dark for the best projection - and that is
virtually impossible to achieve! After all, you'd have to switch off
that light source at the back of the room - you know, the one with the
projectionist behind it :-) :-) :-)

Bob Aldridge
---
 * POW 2.0  0007 * Projectionists do it in the dark.


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

End of PHOTO-3D Digest 2374
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