[photo-3d] Re: Bothersome Dissolve or Projection in general???

[Bruce Springsteen <bsspringsteen@xxxxxxxxx>]

Howard Wade wrote:
> I'm way behind on my P3D reading, but this one really caught my 
> attention. My wife and I spent a lot of time in the Stereo Theater at 
> Mesa, and by Sunday she had developed a screaming headache that 
> lasted for at least the next three days. There was plenty of 
> dissolving going on, but it was also a more intensive 3-D viewing 
> experience than she had experienced before. Her doctor thought the 
> problem was in the polarizing/depolarizing process that occurs in 
> projection. I'll ask him for more details on his theory and report 
> back.

Earlier in this thread, I was wondering how much discomfort in projection
might be due not to dissolves or deviations, but simply to the uneven
image transmission (and perhaps poor alignment) of the cheap polarizing
material in most 3D glasses.  I'm usually aware of lots of reflections and
brightness variations and wavy distortions and smudgy fuzziness when
viewing projection with the standard glasses on hand.  Do people with
optically excellent glass-lensed viewing specs fare much better in the
headache department?  I'm guessing yup.

My recent first experience of an iWerks 3D film (a field trip of the
Heartland Stereographic Society!) was readily viewable, despite huge
convergence ranges (from infinity to 3 feet by my reckoning!), frequent
motion and dissolves and changes in depth range - all no big deal.  The
only noticeably irritating factor was the usual weak link - those cheap
warped plastic polarized glasses.  What's the point of sharply focussed
images well projected with bright light seen from a seat with a
field-of-view-filling angle, when you're only going to plop murky plastic
blinders on your face?  I don't dig it, dudes and dudettes.

I think the source of these headaches may be closer to our heads than
previously supposed.  But I haven't seen much more projection than
Howard's wife has, so what do I know?  What can you tell me?

Bruce





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