Re: [photo-3d] Re: Re: pulfrich "stereo base"

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

You came very close to answering that question yourself.  If you have a
motion picture camera that exposes 24 frames in a time period of one second,
then the time it takes to get from the same point on one frame (shutter
position) to the same point on the next will be 1/24th of a second.

Actually, unless the subject is moving, just panning won't do it by itself.
And, if the subject is moving, it does not matter if you are panning or not.
If the subject is not moving, the only way you can produce the Pulfrich
effect is by a lateral dolly move, either linear or in an arc.

With a pan, all frames are imaged from a rotation about, or extremely close
to the film plane.  Thus, there is no (or extremely little) parallax
differentiation from one frame to the next.

With a lateral dolly move, the camera at one point is in a position
corresponding to the position of one lens on a stereo camera, and at some
later point is at a position corresponding to the other lens.

The above is a very simplified description.
To do this correctly requires consideration of several other factors.  If
you would like more detail, please send an e-mail directly to me.

JR

----- Original Message -----
From: "Sergio Baldissara" <winter@xxxxxxxxxx>
To: <photo-3d@xxxxxxxxxxx>
Sent: Saturday, October 28, 2000 2:22 PM
Subject: [photo-3d] Re: Re: pulfrich "stereo base"


> I must thank everybody answered my posting, but I now realize I asked the
> wrong question.
> I had to ask: "what's the time lapse (frame lapse at 24 fps)  between the
2
> frames of each stereo pair in Pulfrich movies?"
> The "stereo base" of course depends upon the panning speed, but I must
know
> the above figures (in milliseconds or in frames) to set up my panning
speed.
> Sergio
> >
> > Message: 18
> >    Date: Sat, 28 Oct 2000 11:57:19 -0000
> >    From: "Chuck Holzner" <cfholzner@xxxxxxxx>
> > Subject: Re: pulfrich "stereo base"
> >
> > --- In photo-3d@xxxxxxxxxxx, "Abram Klooswyk" <abram.klooswyk@xxxx>
> > wrote:
> > > sergio baldissara wrote, Oct 18, 2000:
> > > > how long is the delay between cone vision and rods vision?
> > >
> > > Jim Crowell has pointed out that "rods are not typically involved
> > > in the Pulfrich effect" (Oct 18, 2000)
> > >
> > > However, it seems to me that the _question_ was in error in the
> > > first place.
> > > The Pulfrich effect is based on delay between left and right eye.
> > >
> > > Abram Klooswyk
> > > (Sometimes somewhat delayed in answering)
> >
> >
> > So which eye is delayed from the other?
> >
> > Chuck
>
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