P3D RE: P3D 2 x 2 Projectors

[wduggan3d@xxxxxxxx (WILLIAM A DUGGAN)]

>I did not see what projector Dr. T >recommended in response
 to someone's question as to the best 35mm projectors for Stereo. 

 I  recommend two KODAK>EKTAGRAPHIC IIIA (or IIIAM) projectors 
 with "FF" flatfield KODAK lenses.  Flatfield lenses have WHITE
 lettering on the end of the lens barrel, whereas "C" CURVED FIELD
 lenses  have BLUE lettering on the ends of the barrel, and can only
 focus either the center OR the edges (not both) of glass-mounted 
slides ( and of glassless slides which do not "POP" into a convex shape 
 when heated, as was and is the case with the OLDER EKTAGRAPHIC 
and CAROUSEL projectors, which I recommend you AVOID purchasing. ) 
 EKTAGRAPHIC III projectors are so cool that glassless slides will
 NOT pop into the convex shape requiring "C" lenses, so the "FF"" lenses
 are the best whether you have glassless or glassed mounts

All EKTAGRAPHIC projectors have a side-ramming mechanism which 
positions each slide perfectly in the gate every time, so NO horizontal
or 
vertical adjustments are needed if your slides are correctly mounted, and
 you can go FORWARD and BACKWARD repeatedly for ANIMATION.
CAROUSEL projectors DO NOT align slides precisely in the gate, so that 
even correctly-mounted slides must be adjusted, and "ANIMATION" is not 
possible. BE AWARE that the side-ramming mechanism in some of the
 OLDER (discontinued) EKTAPRAPHIC projectors (which you can only 
buy used) is so strong that it can bend and pop apart cardboard mounts,
 causing jams.

The "A" or "AM" stands for automatic focus, which you can turn "ON" or
 "OFF" (for soft focus slides.  In my eight EKTAGRAPHIC IIIA projectors
 the automatic focus works perfectly, after you focus the first slide,
even with
 a tray of varied mounts, a mixture of cardboard, thin plastic, thicker
GEPE 
and WESSPLASTIC mounts. As the glass in slide mounts varies in thickness,
 even with all GEPE mounts, you really need automatic focus, especially
with 
the magnification of larger images or projection at greater distance (
Such as 
at 52 feet at NSA Conventions).  If you buy EKTAGRAPHIC IIIA projectors
used, 
check out the automatic focus before you buy, as many used projectors
have
 had heavy usage as rentals or in corporate Audio Visual departments, and
 were sold only because the infra-red sensor in the automatic focus 
mechanism needs to be repaired or replaced, which may be costly.

New EKTAGRAPHIC projectors usually come with standard EXR lamps.
I recommend the brighter " EXW-5" lamps, which are not quite as bright
 as the "EXW", but are longer lasting.  The "EXW" lamps are rated at 
17 hours, and I had one burn out in 30 minutes at NSA-San Diego.  As  
"EXW" lamps burn at their top voltage, they have  NO VOLTAGE reserve
 when a SPIKE of higher voltage comes down the line, as when some 
other projector or other appliance on the same line is turned off.  As
the "EXW-5" lamps are burning at a lower voltage than their rating, they
have
 a voltage reserve, AND I HAVE NEVER HAD ONE BURN OUT, even after
 more than 100 hours of projection.

I recommend internal BRACKETT>Polarizers (available from BRACKETT
ENGINEERING), which clamp on the  EKTAGRAPHIC III condensing lens,
 where they stay cool from the internal fan, they stay clean (no tendency
to
 collect small particles floating in the air), and where they block about

one-third of the heat from reaching your slides,  thus keeping the slides

cooler.

 However, slides which have a mylar backing, such as POLAROID Black 
and White instant slides, or slides with  KODALITH masks or titles will 
depolarize light, causing "ghosting" or double images, in which case you
 must hang polarizers over the lenses. I recommend Reel 3-D Enterprises 
for these polarizers.

Enough for now.  More later on lenses and lamps.  Hope this helps.

 Please check out the NSA WEBB SITE at        http://nsa-3d.org 
and click on all the many links, especially the organ music and photos 
of the restored, plush BYRD Theater, where 3-D movies will be shown
 and let me hear as soon as possible from you SHOW PRESENTERS
 and WORKSHOP PRESENTERS at              wduggan3d@xxxxxxxx

William A. Duggan, APSA, NSA Projection Consultant and PROGRAM
COORDINATOR for NSA '98 Richmond, August 6-10, 1998. 










  
the left images projector stacked over the right images
>projector.  They can be purchased new from some New York 
mail-order stores advertised (In photo magazines and SHUTTERBUG) 
for as little as>about $325 each, with KODAK 3-Year warranty (The
 Warranty is on the back page of the Instruction  Manual that comes
 in the box with each projector.  One store may try  to  charge $15 extra

 for the warranty.  DO NOT PAY IT.  Use a credit card, and DISPUTE any 
extra charge over the advertised price, )and of course
 less if purchased secondhand. Some used EKTAGRAPHIC IIIA (or AM)
projectors need repair or replacement of the INFRA-RED SENSOR which
operates the AUTOMATIC FOCUS, so check out the AUTOMATIC FOCUS before you
buy, as replacing it may be expensive As they
register
>each slide perfectly in the gate and have automatic focus, no
adjustments are
>needed for correctly mounted slides in GENE or WESSPLASTIC mounts.

Thanks, good to know

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