[photo-3d] Re: [3Dsalon] Misalignments & stereo projection

["Dr. George A. Themelis" <drt-3d@xxxxxxx>]

Steve Dudley writes in 3Dsalon:

>At the Chicago Stereo Camera Club competition nights,
>there were three remote cables extending in front of the
>projector for the 3 adujstments (focus, horizontal, vertical).
>It was quite a spectacle to have four people (projectionist
>was a seperate job) working on the projection the first time 
>or two I witnessed it, but it worked great.  

For you maybe... When I attended my first (and only) CSCC
meeting in 1989, even though I was a beginner in stereo, I 
already knew that something was wrong with this picture... 
My eyes were telling me that this was wrong.  Especially 
the horizontal adjustment.  I was puzzled and unsure why
this was changed.  It was changed to minimize ghosting.
I continue to think that this is a very-very BAD idea. 
I also continue to think that changing the vertical
alignment to correct vertical mounting errors is also
a bad idea.

To go back to Steve's previous posting, when I left the
St. Charles 1997 PSA convention, I had mixed feelings 
about stereo projection.  Just like Steve, I felt that the
TDC projector has been a reliable workhorse for 50 years
and the new "fancy" projectors cannot match this reliability.
"Life was simple and BETTER" back then, when the TDC was
used, was my thought.  However, there is a limit with
the TDC. This limit is the 70x70 in. screen.  Unless
"beefed up", this projector cannot be used for large
audiences (but it is still perfectly adequate for small 
audiences and home use). This summer I attended the NYSS 
meeting in July and I must admit that their dim TDC on 
the large screen was a disservice to stereo projection, 
especially compared to the Ektagraphic 2x2 projection that 
followed.

We need a better (more powerful, reliable, simple and
easy to operate) stereo projector.  I believe the RBT
projector meets these requirements, except for the
glass mount question and the high price.

On a personal level, with my RBT projector I have now 
progressed from the 5 people projection team to the 0 
people projection team.  I plan to test drive the RBT
in our club competition this coming Tuesday on a "mix
bag" of slides.  One of the judges can hold the remote 
to advance and focus, if needed.  Nothing else is 
changed.  No projectionist is needed.  From what I have
seen so far, I am confident that everything will go
well.

George Themelis



 

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