Re: shift lens for 3d movies

[P3D John Bercovitz <bercov@xxxxxxxxxxx>]

Henry writes:

> So how you start if you were to built these sets o lenses,
> let say for dual band, two film strip shooting?

I'd just put them both on slides and drive the slides with
left hand and right hand screws on a common shaft.  The nuts
would be turned for adjustment once, and then locked into place 
on the slides.  I think you could still have swings and tilts
too, if you use/need them in this sort of work.

If you use two separate cameras so that you can vary the 
stereobase, then I'd drive the same slides with servos in
essence emulating the setup described above.

If you used long taking lenses, you could change the stereobase
with a system of mirrors and also do shifts to move the window.
Maybe a 2X normal lens.  Is 35 mm format 24 wide and 17.5 high?
Then 2X normal would be about 60 mm.  Would that be long enough
to put the orthoseat in the middle of the audience?  I don't 
know what the proportions of a theater are (length vs screen size).
Seems like 60 mm would be enough to change the stereobase a _little_ 
with mirrors.  I should sketch it before speculating further but 
what I have in mind is a mirror over the film and a mirror behind 
the lens and the lens/mirror assembly rotates around the axis of 
the lens where that axis pierces the film.

Could you use a couple of 60 mm Micro-Nikkors?  It would be 
intriguing if you figure what drives them to focus and use that 
too!  These should give you plenty of coverage on 35 mm movie film.

John B


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