Why cut-off corners?

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Hi, I have been playing with my Dukane 4000/NEC 1545v setup for a while, and I'm quite pleased with it. However, I would really like to know: why are the corners on pretty much every overhead stage cut off? One fellow here dremeled his out to get more real estate; is there any disadvantage to this?
 
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John, can you give me an idea of what you used ? I'm bulding an A+K 400 W OHP with 15" Samsung 510N LCD... but I'm a little worried about the LCD, I want it alive... jejeje...

1) Did you use and IR or UV filters ?
2) What did you use for cooling ?
3) What distance between fresnel and LCD ?

Thanks !!!!!!!!!!! And good job. Do you have photos ???
 
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