[MF3D.FORUM:1021] Buffalo NSA

[Richard Twichell <rmt@xxxxxxxxxxxxxxx>]

David Kesner writes:

> I have mounted many Spud images in RMM mounts, but for the 
> projected show we will need to use single Gepe mounts. I heard 
> that there is not much room for window adjustment. Is that 
> true? Any suggestions or pointers on how to get the best 
> mounting out of this combination?

That is very true - the Sputnik chip is about 55.5mm and the gepe
aperture is about 53mm or 54mm.  So you have more adjustability than
with 5p but less than with 7p in 35mm.  But it's enough - if you follow
the usual rules - no near points less than 7 feet if infinity is the far
point, etc.  At risk of opening the usual can of worms when the subject
of Maximum Allowable Deviation comes up, let me give you my rule: 
Maximum Allowable Deviation is 5 percent of chip width. (flame shields
up) This conservative figure will make projection comfortably viewable
in most situations:  with a 10 by 10 foot screen, with coincidental
projection, that is, Projection Window (sorry, Abram) on the screen, the
infinity points will be 6 inches apart. Too much for a living room,
perhaps, but in a large hall most people will be sitting far enough away
so that their eyes need not diverge excessively, if at all.
But I'm not making any rules about this for anyone but myself - the
introduction of MF projection at NSA Buffalo should be an exciting
event, and there's room for everyone to demonstrate their theories and
practices of mounting, determining deviation, etc.
The projection staff will be pleased to cooperate with all presenters
who wish to participate in this experimental and demonstration part of
the Stereo Theatre.
Presenters who have their own equipment will of course be able to set up
their shows as they please.
The equipment we will provide consists of a 4-projector setup capable of
dissolve between pairs.  We will have extra European style 30-slide
trays for presenters to use, in pairs for sequential projection, or in
quad for dissolve.
Hopefully everyone will use the standard thumbspotting protocol with red
for the left chip and green for the right.
Two useful tips:  although we will project anything that will fit, I
recommend Gepe mounts with glass.  I also recommend that they be closed
with a press, not just hand-squeezed.  This precaution prevents slide
hang-up in the changers.  There will be a gepe MF press available for
use by presenters who don't have one - it's a quick process to give each
one a fast squeeze in the press.  If you opt to take your chances with
unglassed mounts, its best not to mix them with glassed. The focus is
slightly different between the two.

We will have a couple sets of lenses, so anyone interested might like to
try Panoramic slides using the gepe #2603 panorama mount, aperture size
22 x 54 mm. Sequentials or pairs taken with 35mm Widelux fit this mount
nicely.

So that is a little about plans for Buffalo - it's early, and everything
is not in place yet, but I wanted to give people lots of time to get
shooting while there is plenty of good weather left (here in the north)
for it this year.

And thanks for asking!

Dick Twichell