P3D Re: Twining question

["David Lee" <koganlee@xxxxxxxxxxxxx>]

----- Original Message -----
From: David Lee <koganlee@xxxxxxxxxxxxx>
To: Multiple recipients of list PHOTO-3D <photo-3d@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, March 01, 2000 9:35 PM
Subject: P3D Re: Twining question


>
> > I have a Noblex 6x17 camera. This shoots a panoramic (~140 degree) view
by
> > swinging the lens and projecting onto a negative that is curved  instead
> of
> > flat in a normal camera. That is the filmplane follows the same diameter
> > curve as the lens swings.
> >
> I have shot a few stereo images with a camera called a Panon. This camera
is
> about 6x12 with a 50mm lens (very wide angle) if I recall, with a swinging
> lens similar to the Noblex. The images seemed to work out okay, but be
aware
> that as the lens swings off center the parallax (stereo effect) diminishes
> until it would reach zero if it were making a full 180 degrees. This makes
> more sense if you think of the lens pointing parallel to the film plane at
> the beginning and end of its travel (if it were at 180 degrees).

I didn't state this quite right. The film plane is curved so the lens axis
couldn't be parallel to it. What I should have said was that the axes would
be parallel to the camera back which also means that it is parallel to the
line of camera movement, so there can be no parallax.

David Lee