Re: Projector from Hell

[P3D Sam Smith <3dhacker@xxxxxxxxxxxxx>]

Oliver wrote:

>I caught sight of this thread while I was whipping through some old
>digests that I couldn't check out in detail, and found that it has all
>the symptoms of a little-known phenomenon -- you don't have a projector
>from Hell, you have a slide with a film base from Hell!  I had some
>experience exploring this many years ago, and discovered that a few
>batches of film have a base material that unevenly rotates the axis of
>polarization of polarized light passing through it. 


YES, YES !!!! Finally someone to prove I was not crazy. I forgot to post
this, but I had been using a particular slide for my testing that was in a
5P mount. When I switch to a 7P slide the problem disappeared. Since
adjusting the lens width was my only change, I could only assume it was an
alignment problem. After a lot of tinkering, I finally just tried another 5P
slide and PRESTO! no problem.
The slide was actually a B&W tranny I'd made from Graphic Arts film or Tech Pan.

Thank you very much for this info Oliver, another note I will save to my
BEST OF P3D list !!!!!!


Sam
The 3D Hacker
website: http://www.cadvision.com/3dhacker/index.htm


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