matching bright areas

[bercov@xxxxxxxxxxx (John Bercovitz)]

Dr. T writes:

> The worst adjustment I have seen being practiced, and I am sorry to say
> that they were doing it in the Chicago Stereo club, is to try to change the
> horizontal separation to match bright areas in the background and eliminate
> ghosting.  This ajustment is totally unjustified and destroys the stereo
> window which contributes greatly to the projected impact.  I am surprised
> that some people find it appropriate...

Boilerplate: I respect and value your opinion but...  ;-)

I've had projectionists do this too and I think it's OK as long as 
they don't have to move the horizontal adjustment too far.  Depth 
perception isn't too much affected by convergence as long as it's 
not radical.  I'm not bothered by the stereo window not being at 
the screen either.  (Heresy!)  So I don't see a problem with adjusting 
if the bright spots aren't too far apart to begin with.  We had one 
recently where there were two bright spots and they were at different 
depths.  Pretty tough to match that one!  8-)  Best of all would be 
good rejection by the polarizers/screen system but you can't have 
everything al the time.  Darn!  So what do the projectionists on this 
list think of the practice?  It's only used in a high-contrast situation 
of course.
Thanks,
John B


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