P3D Re: Projection Adjustments

[aifxtony@xxxxxxxxxxxxx (Tony Alderson)]

>Dr. George A. Themelis wrote:
...I am convinced that projector adjustments should be kept to an absolute
minimum. The only adjustment that makes sense is focusing and this is
needed only if mounts of different thickness are mixed up. The worse
adjustment IMO is moving the images horizontally to match highlights and
eliminate ghosting.<

>I might be influenced by McKay on this, but I have seen projection
>sessions where the projector is continuously adjusted and it is like a
>nightmare... The eyes are called to do weird exercises and more time is
>spent trying to adjust to the shifting images, than enjoying what is being
>projected in the screen.<

This subject periodically resurfaces here at the Stereo Club of So. Calif.
The majority always seems to feel that adjusting during projection is the
better option, to get a "better" view of "beginners'" slides, and to
accomodate masks of varying types . Personally, I feel riding horizontals
is a bad idea--I prefer a little ghosting to the constant eye twisting. It
also screws up deliberate window tricks like "double depth." I won't even
look through my glasses until the adjustments are over.  However,  since we
allow cardboard and unglassed mounts in competition, riding focus and some
vertical adjustment seems almost unavoidable. On the other hand, our club
twin projector rig CAN'T be adjusted during the show, and nobody seems to
miss it there...

Tony Alderson
aifxtony@xxxxxxxxxxxxx



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