3D Separate 2x2 Projection

[P3D Bob Aldridge <bob.aldridge@xxxxxx>]

Gregory J. Wageman wrote re: 3D Separate 2x2 Projection
->Message-ID: <199610090058.RAA09876@xxxxxxxxxxxxxxxxxxx>
-> 
-> 
->Is anyone on this list using independent 2x2 projectors?
-> 
->I'd like to know what equipment you're using, what filters, how you
->mounted them, etc.
-> 
->I've got a pair of Kodak Carousel 4400s with matching 100mm Flat Field
->lenses.  I'm using a pair of round polarizers from Edmund Scientific
->which I've simply taped to the front of the lenses.  They are exactly
->the size of the front of the lens barrel (2"dia) and so allow the lens
->to recess fully.  It's not high-tech, but it works.

At the moment I'm NOT using separate 2x2 projectors, but have used both
pairs of Rollei projectors and pairs of Carousel projectors.

For both, I fitted the polarisers inside the projectors. On the Rolleis
I mounted them just behind the slide gate. With the Carousels I put them
into the "spare" channel in with the condensers (intended to be used
with extra optical elements for formats other than full frame...)

I assume your lenses are of the rack focussing type, in which case your
method is perfect - and will not be affected by mylar based film which
depolarises the polarised light beam with my method... (Fortunately,
mylar is not too common as a film stock, but some graphic arts films
have it).

With the Stereoscopic Society's Royale projector (which is basically two
straight magazine projectors, joined one above the other) we use filters
mounted in a frame that stands in front of the lenses. The lenses of
this projector rotate for focussing, so we can't mount onto the lenses
conveniently.


->I'm currently using the "stock" projection lamp (FHS?), but am
->thinking about moving to the EXR lamp, which is supposed to be much
->brighter, at half of the rated life.  However, I've seen traffic on
->this list that suggests that this may be a liability rather than a
->benefit, due to increased "ghosting".
-> 
->Any experiences?

Ghosting shouldn't really be a problem with usual subjects, but will be
a problem - almost whatever you do - with extremely high contrast
subjects e.g. fireworks, floodlit buildings etc. It will, of course,
show up more with brighter bulbs. But then all your other slides will
looker better, won't they! Everything is a compromise :-)

Bob Aldridge
Stereoscopic Society Projectionist
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