[photo-3d] Re: curved projection screens (was Re: Legitimising 3D Movies)

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

IN digest 323 Mike Canter wrote

 
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> In Digest 321 Herbert C "Bob" Maxey writes:
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><< 
> Eastman Kodak once offered a screen that was also slightly curved. It was
> called an Ektalite Screen, and without any doubt, this was the finest
> screen I ever saw.   >>
>
>To which P.J. Homer adds:
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>
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>How about this:
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>http://www.da-lite.com/Catalog/html/triwall/da-curve.html
>
I was interested in this because I had not realised any curved screens were used for slide projection. I tried them because of their highly reflective surface but assumed the curvature was to compensate for that of projection CRT's
and in fact although I did not mention this in my original post I did get distortion and even defocussing of parts of the image when I tried to project stereo slides.Presumably because they are flat without the curvature the screen is meant to compensate for with an equal but opposite distortion leaving the distortion due to the screen itself. P.J.Homer