[photo-3d] Re: 2x2x2 projection

[Bruce Springsteen <bsspringsteen@xxxxxxxxx>]

Jim (the Abnormal) Norman:

> A day or so ago, I asked for advice on what size "spacer" to use between
two 
> full-frame 35 mm slides for projection via the rear channel of a TDC 116

> slide transporter.  Thanks to those who responded.

Must have been off-list response.  What reasoning did the explainers use,
Jim?  Is that projector made to successfully project 8P slides in a
Realist-sized stereo mount?  If so, I assume that a window separation
matching that of slides made for that projector would be the way to go, if
possible, or maybe (for mechanical reasons) matching the total width of a
stereo slide regardless of resulting window separation?  If some other way
of adding it up was advised, I'd be interested to hear the argument.  

Or maybe there really was no response, as it sounds like he did some
independent work:

> Now, after some experimentation, for those who may be interested, here's
> what I found:
> 
> For vertically-oriented slides (sorry, all you horizontal lay-down
types), 
> any spacer less than 5/8-inch results in fairly serious vignetting of
the 
> upper left and lower left corners of both images.  So, 5/8-inch is what
I'm 
> using.  I haven't tested this spacer with horizontally oriented 2x2x2
slides, 
> but with the plethora of available horizontal format slide mounts, who'd
want 
> to use 2x2x2 horizontally anyway?
> 
> Jim Norman, an upright, vertical kind o' guy.

Maybe a 2x2x2 horizontal shooter who doesn't feel like remounting in
stereo slides for a TDC show would find your invention nice.  Is this
spacer attached to the 2x2's, or just loose between them somehow?  What
should it be made of?  If the coverage of the projector is adequate for
the full vertical image, I guess it would be for the horizontal as well,
and I'd expect the same spacer size to apply, since the slide is the same
width as height, and the aperture is centered in the slide both vertically
and horizontally.  Are all these assumptions true? 

Curiously,
Bruce (the Recumbent) Springsteen

[Non-horizontal portions of this message have been removed] 

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