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Topic: Does a drive-in movie theater use the same type of projection window as a
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Frank Angel
Film God
![](http://www.film-tech.com/ubbmembers/248b.jpg)
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 03-07-2005 12:33 AM
I have had good success with Lexan, a brand name plexi which seems to have a harder surface than generic plexi and thus less susceptible to scratches which is a property where optical glass wins over plexi. Our Lexan has lasted for a decade before I decided it needed replacement. I treated it as if it were a lens, cleaning it only with camel hair bush and then when it got any grim on it, cleaned it with diluted dishwashing solution. If you are the only one messing with it, you can keep a Lexan port a as scratch free as any glass window.
Although I have never seen any stats on it but it, I don't believe Lexan causes any color or geometric distortion (at least not the 1/4in thickness variety). If you look at the edge when light is passing through plexi, the edge lights up white. This is what water clear glass looks like so I am assuming it has at least as good transmission properties as water clear. On the other hand, light dissipating at the edge indicates that there is some internal light scattering, although my experience has been that it doesn't cause any significant loss or contrast degradation, if you are in a situation where every last fraction of a footlambert is critical, then go with high quality, double surface coated optical glass -- but you'll pay a lot more for it.
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