116 vs. 716 and more (part III - conclusions)

[P3D Dr. George A. Themelis <fj834@xxxxxxxxxxxxxxxxxxxxx>]

The question was posed about the differences between the 116 and 716
projectors... I think these two projectors are about equivalent and it is
the choice of light bulbs and lenses that can make a difference.  Both
projectors can use 4" or 5" lenses and 500W or 750W bulbs (IMO, 750W bulbs
work OK in the 116 even though they are were not recommended by the
manufacturer).

For long time I used the 116 w/ 5" & 500W bulbs and 50x50 screen.  I was
happy until I noticed that it was getting dimmer and soon one bulb died.  I
then put a pair of 750W bulbs and I saw a significant (for me) difference
in brightness.

Lately I have been looking into various aspects of stereo projection,
screen, polarizing glasses, lenses, light bulbs, sound, etc., especially
since I am getting ready for public shows at work and the (under
construction) Cleveland Stereo Club!   Right now I am focusing into lenses.

As a way to upgrade the TDC I am looking into installing modern 100mm/2.8
projection lenses which are fairly common in modern projectors.  I have an
accessory that replaces the lens holder in the TDC (any model).  This is a
custom but well-made job.  Instead of threads it has two long cylinders and
a clip that will hold lenses of 45 mm barrel diameter but thinner lenses
could be somehow adapted to fit.  I am not sure how much of a difference to
expect with these modern lenses.  I am not even sure if the 2.8 aperture
rating equates to more light than the TDC lenses (3.5 aperture).  But I
seem to remember that the Brackett Dissolver images are more clear/sharp
than the TDC in the Detroit club (that is, if Billy Turner can make the
Brackett work as it should!)

A few more interesting TDC accessories that I have acquired:

- Projection table (a must if you are traveling, plus it can be raised
higher which results in more reflected light)

- Long flexible cables that allow you to change the 3 controls from a
different location (can be placed in the side or back of the projector or
be given to people in the audience to handle the controls)

- Adapter carrier that will project the old glass slides 45x107 mm size.

I have learned a lot and plan to write a book on the TDC projectors that
will serve as an introduction into stereo projection too.  (Yes, I am
moving from viewers to projectors... too many people are worried about how
to capture the stereo image but very few are concerned about how to see
what they have captured... I am here to take care of this important aspect
of the 3d experience...)

I can see the question in the minds of non-TDC/Realist projection fans: 
Why bother?   Well, why not?  In terms of a Realist format projectors there
is not much new available at affordable prices.  For around $300 to $400
you get a very reliable TDC projector which can handle projections at home
or club level.  I like the simplicity and reliability of the TDC and would
like to push its performance to the limit.  When I reach this limit and if
I have the money, I might "upgrade" to a Brackett Dissolver or an RBT.  The
TDC (and a few other 50s projectors) is the perfect way to be introduced to
the wonderful world of personal stereo projection!

Thanks for listening! -- George Themelis


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