Projection dos and don'ts

[Derek Gee <73157.2172@xxxxxxxxxxxxxx>]

Bob H writes:
>The most important thing about stereo projection is THIS! "Never touch
>the controls (except slide advance) once the people put on the
>polarizing glasses!"
>The cause of most misery is a projectionist without glasses trying to
>align what he perceives as misalignment while people are viewing.
 
Bob, I have to disagree with you here.  I'm the club projectionist for 
the Detroit Stereographic Society, and while I agree that the best
projection is not noticable by the audience, it's just not possible
to show a number of unfamilar slides and not adjust as you go.  Earl
Krause agrees with me.  (See pages 51-55 of "Three-Dimensional Projection".)

For competitons, once I set up to our alignment slide (which is a mounted
Reel 3-D alignment gauge), I make minimal adjustments as needed.  Focus
and interocular adjustments are the most common, but occasionally I will
make a horizontal adjustment if it's minor.  Afterward, I will re-insert
the alignment slide to put the adjustments back to standard if I have made
significant changes.  I have never seen a projectionist making changes
without wearing glasses and I never do.  I suppose you could make changes
without wearing 3-D glasses, but I would be very surprised if they came
out well.  Anyway, I would much rather correct each slide if possible, 
than torture the audience's eyes with ghosted, difficult to fuse 3-D.
 
                                 Derek Gee
                                 Vice-President
                                 Detroit Stereographic Society

   


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