Re: [photo-3d] Digest Number 298

[Olivier Cahen <o_cahen@xxxxxxxxxxxxxxxx>]

	Do not presume, but CHECK that your slides are conveniently mounted.
For that purpose, remove your polarising glasses, and check whether you
actually see all the homologues side-by-side, without any vertical
shift. The same on ALL your slides. The tolerance for a vertical shift
is never more than four millimeters, as measured on the screen, for a 
viewer being seated seven feet away from the screen (this is the normal
viewing distance for projected images about one meter high).
	Then check the convergence of your projectors. The horizontal deviation
between homologues of objets at the infinite must NEVER be over 2 1/2
inches.
	Then check that the stereo window is NEVER behind any object on the
left or right border of your image.
	If these conditions are OK, your viewers will never get tired after
your projection, even with a blank between your slides. The simple
projectors let the screen black for a few seconds, this is a minor
drawback. Three thousand dollars beyond, you can fade to black, then to
your next image, with a RBT projector, it is much more pleasant. Is it
worth $3000 ? It is up to you.
	You can start to dissolve ONLY after being sure that your mounting is
perfect, vertical shift no more than TWO millimeters on the screen, and
stereo window adjustment as precise as two millimeters on the screen.
This is not for a beginner.


> Message: 9
>    Date: Thu, 12 Oct 2000 21:15:48 -0000
>    From: dougorama@xxxxxxx
> Subject: Slide projection
> 
> As a neophyte 3d'r, I am concerned about these headaches, nausea and
> whatnot asc w/ viewing 3d images. Presuming the slides are mounted
>  "perfectly," which of the following would be LEAST jarring to the
> audience?:
> 1) Dissolve between two 3d images
> 2) Fade to black, then fade in next image
> 3) One image to next, with quick black transition between{such as a
>    one projector 2d show}
> 
> Also... would a practical limit for viewing be about 20-30 minutes?
> Slide projection is a must: Viewers are impractical for my purposes.
> 
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