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[MF3D.FORUM:1161] Re: Camera design


  • From: Greg Erker <erker@xxxxxxxxxxxxxx>
  • Subject: [MF3D.FORUM:1161] Re: Camera design
  • Date: Fri, 25 Aug 2000 13:48:13 -0600


>If you are going to use a FP shutter anyway, why not go all the way and
>make it a DLR (Double lens reflex)? That way there is no need for a lens in
>the middle, could have a 2 1/4" stereo base, and you would have at least a
>possibility of also viewing directly in 3d. If I ever find someone with a
>Mentor Stereo Reflex camera (ANYONE?!?!) I could complete my version of
>this which has been on hold for months due to a shutter curtain problem
>needing to be solved.

  That's a neat idea but it does
complicate things. The FP shutters
I have in mind are right behind the
lens not actually at the film plane.
So the reflex mirror would be required
to keep 100.000% of the light from
reaching the film. You would also have
to rig up some mechanism to close the
behind-the-lens shutters, pop up the
mirror and then re-open the shutters
for exposure.

  The shutters I'm thinking of still
have to be mechanically cocked so
you'd have to recock them in the middle
of this jig.

  If I were going to build a DLR
I'd likely use Bronica SQA lenses.
They have a Seiko leaf shutter in
the lens that I believe is mechanically
cocked and tripped but is electronically
timed. So syncing them should be
feasible. They would already have
the mechanism for the: lens wide open
and shutter open for viewing, then shutter
close aperture stop down, then shutter
open for exposure: that a leaf shuttered
SLR needs.

  Sawing apart a couple of $2500 Bronica
SQA or SQB's would likely do the job :)
But that's a lot of loot. Maybe for
my third MF stereo camera.

---

  Does anyone here have experience with
vertical travel 35mm shutters?

Greg E.