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Lighting: Projection - Lens Calculators:
Gobo Magnification Chart Barco Projector Lens Calculator
Gobo Pattern Chart Christie Projector Lens Calculator
Pantone Color Chart Panasonic Projector Lens Calculator

Source Four Lighting Throw Chart

Sanyo Projector Lens Calculator

 

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Video:

What Size Screen Do I Need For My Room?

Quick Guide to Aspect Ratio
 
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