Re: Shift lenses for 3d cinematography

[P3D John Bercovitz <bercov@xxxxxxxxxxx>]

I just realized this conversation was being cced to P3D.
Good idea; I'm sure there are others interested in hearing
what a person who really makes 3D films has to say.  Here
is my response to Henry's last message:

> Well yes,two strips in camera, elegant but how to vary the interaxials?

I may be terribly naive but I would say, don't vary the interaxials.
In fact, I wouldn't vary the convergence or shift either.  So there's
no need for that which I suggested should be built!  8-)  I wonder what
would happen if you did that.  In a fair-sized theater, most everything
would be off the screen but I don't think that's bad.  Comments?  It
would change your shooting technique.  You'd have to watch out so you
didn't have the window cut an object.

If you must vary the interaxials, then it's back to using shift lenses
run by encoded steppers or servos.  That way they can be shifted in
synch with each other while the stereobase is being changed.  In fact,
the change of shift and change of stereobase could be locked together.

John B


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