[photo-3d] Re: Are beamsplitters crappy?

[Mark Shields <beamsplitter@xxxxxxxx>]

I always enjoy it when beamsplitters come up again--don't get
too much chance to discuss them!

A pro and a con:

I forgot to mention the glorious ease of mounting of beamsplitter
shots (and I do mean the Pentax-style, common-use-of-the-term
item)--you can let anybody at all do it, or you can easily do
it yourself. I do it myself for two reasons. First, they tend
to come back a little off center sometimes. Since they are so
easy to mount, I don't mind doing it myself. Second, since I also
send Nimslo slide rolls to the same lab, I don't want them to
get confused. I hope by now they are used to the fact that when
they see something coming from me, they will automatically think
"Do Not Mount--Do Not Cut."

On the other hand, while you can easily take reasonably fast action
shots with a beamsplitter on any SLR, those with a horizontally
running shutter, like my Olympus OM-10, will give you a problem
with faster action, no matter what speed you use. That's because
the speed is achieved by passing a variably narrow slit past the
film at the same rate of speed, about 1/60 to 1/125 second. This
does cause a problem for me sometimes. I get two different images
of the action. If your SLR has a vertically running shutter, no problem.
This same phenomenon will also cause linear distortion of
a flattie image if the camera moves up or down significantly
during the exposure, and the subject is moving fast. I've seen
some very interesting train shots where this happened!

As to the comment about the reason for using two cameras, I'm not
sure I understand the question, but I would say it's for taking
stereo pictures, one image from each camera!  :-)

Mark
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