Any standard microscope will work with a Bolex.... Edmund Optics will
sell you a standard device that will replace the eyepiece of the scope
and attach a C-mount lens to it.  The eyepieces have all been made to a
DIN standard so just about any microscope since the late 1930s will have
the same arrangement.  Edmund will also sell you a relay lens arrangement
which may be needed if you don't have a wide enough focussing range.

It is _easier_ to use a microscope with beamsplitters that allow you to
look through the microscope at the same time the camera is running.  Many
newer microscopes can be ordered with "trinocular heads" that have a c-mount
on top which would allow you to connect a Bolex up and run it while looking 
through the eyepieces.

So... the questions begin with how much you want to pay and what kind of
magnification you need.  You could get a cheap Spencer student microscope
for a hundred dollars or so and use the Edmund adaptor.  You can spend 
$180,000 for a Zeiss Axio with a built-in beamsplitter.  Both will give
you good results at lower magnifications with enough light.  The Zeiss
will have less flare and be a thousand times easier to use especially if
you're trying to track a moving object.

If you're looking to buy an inexpensive scope in the $1000 region, I would
look at some of the Russian microscopes that Edmund Scientifics is selling.
(Edmund Scientifics is not the same company as Edmund Optics... they both
split off the same parent company but one got the conventional microscopes
and the other got stereoscopes).

Unless you're looking for lower magnifications (sub-100X) in which case ignore
all this and look at the Mitutoyo machinist's inspection scopes.
--scott
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