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16:9 (1.85:1) = Wide screen
4:3 = Full Screen, Standard TV size
4:3 Letterbox = wide screen picture on a 4:3 TV with black bars on top and bottom of picture
2.35:1 = Wider wide screen format, (about 25% wider than 16:9)
If you show 4:3 on a 16:9 model you'll have black bars on the left and right hand side of the image unless you choose the stretch image mode. Show 16:9 on 4:3 and the bars will be at the top and bottom of the image unless you make everyone look 10 foot tall by stretching the image! Even using a 16:9 projector you can get top and bottom bars on some DVD's that have a wider ratio than 16:9 (2.35:1)
What is a throw distance?
Throw Distance is how far or close your projector can be from your screen.
The minimum throw distance is a distance which if less causes the image will be out of focus. Having your projector closer to the screen than the minimum throw distance is bad.
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