Re: Old entries

[P3D KENNETH LUKER <KLUKER@xxxxxxxxxxxxxxxxxxxxxxx>]

> 
> Although I was part of earlier mailing lists, I don't remember the 
> first.  I've found some detritus from earlier saves deep in my bit 
> bucket.  Here, for example, is an earlier contribution from Alexander 
> Klein, dating from February of 1992. I've found others from that same 
> month, but nothing earlier.  I should be able to find even earlier 
> somewhere, as could some of you all.  I've included the attached 
> mailing information showing that our correspondence back then was via 
> a system at BFMNY, wherever that was. 
> 
> Ken Luker
> 
> **begin old posting**
> sent on:      13 Feb 92 01:37:00 EST
> by:           Alexander Klein <100041.212@xxxxxxxxxxxxxx>
> the subject:  How to automate stereo mounting???
> sent to:      3D%BFMNY0@xxxxxxxxxxxx (Stereo Photography)
>   
> 
> One of the biggest problems of making stereo photography more popular 
> is
> the difficulty of mounting 3D slides. Of course, those who have under-
> stood the basic theory will know what to do - however the great majority
> of potential 3D photographers *doesn't* know how to mount correctly.
> Besides this, the average photographer wants to go to his photo lab, give
> them his film and get back projectable slides. An automatic mounting-sys-
> tem could mean a breakthrough of stereo photography on the amateur market
> as - at least in my opinion - correct mounting is still the biggest obs-
> tacle of 3D photography.
> During the past months, I have thought on various self-mounting methods
> and on automated mounting machines. I think, that automatic mounting ma-
> chines suitable for big film-processing laboratories could be produced.
> Of course, those machines have to work very accurate. Several (old) sys-
> tems are based on the sprocket-holes as a reference for mounting (like the
> German "Belplasca" System of the 1950's). I think this system works well
> - provided that the stereo window is always set at the same distance.
> However, the average 3D amateur doesn't know much about the 3D window (and
> he doesn't care about it anyway). However, there must be a way to solve
> this problem.
> My idea is to continue using the sprocket-holes as a reference to avoid
> rotation-errors (this can be checked by photoelectric barriers). However,
> there is still the problem of setting the correct stereo window! This
> could be done by exposing dots onto the film rebate area (like the Nimslo
> camera exposed one red LED-dot for correct processing). There would be
> two dots below each image window (film chip): below one (lets say the
> left window) there would be 2 fixed dots, below the other (in this case
> the right window) one fixed and one movable dot.
> As you all know, a good method of mounting is to have the nearest subject
> right behind the stereo window. How can now the mounting-machine find the
> correct spacing of the film chips in a stereo mount so that the subject
> is just behind the window? Every modern automatic camera can figure out
> this distance with its electronics (infrared, ultrasonic etc.) [problem:
> near-by objects like thin branches etc.). According to this measured dis-
> tance, the fourth (movable) LED dot is then exposed onto the rebate area.
> With the help of this horizontally-moving LED-dot the automatic mounting
> machine can do its job. The whole system would look like this (sprocket
> holes not shown, "*" means a fixed mark, "<--*-->" the movable mark):
> _____________________________________________________________
>      ________________                  ________________
>     |                |                |                |
>     |                |                |                |
>     |   left image   |                |   right image  |
>     |                |                |                |
>     |________________|                |________________|
> ____*________________*_________________<--*-->_________*_____
> 
> What do you guys out there think about such a system - do you think that
> it's possible? Any other ideas?
> 
> Alexander Klein, Stuttgart, Germany <100041.212@xxxxxxxxxxxxxx>
> 
> ==
> 3D -- Stereo Photography                  Tom Neff, moderator
>  
> **end of old posting**
> _______________________________________________________________

Kenneth Luker, Assistant Director
Systems and Technical Services
Marriott Library
University of Utah
Salt Lake City, Utah
KLUKER@xxxxxxxxxxxxxxxxxxxxxxx


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