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Rear projection?

Printed From: Community Theater Green Room
Category: Producing Theater
Forum Name: Lights and Sound
Forum Discription: Technical discussion
Printed Date: 9/30/23 at 7:47pm
Software Version: Web Wiz Forums 8.05 -

Topic: Rear projection?
Posted By: jayzehr
Subject: Rear projection?
Date Posted: 12/05/13 at 7:18am
Anyone experienced with rear projection?  Any advice?

Posted By: vickifrank
Date Posted: 12/06/13 at 6:41pm
What do you want to know?

Assuming you are rear projecting with a full stage projection. You have several concerns:

1.) Is your projector big enough for the size of projection. (How many Lumens. Number of Lumens is the strength of the projector)
2.) Do you have enough upstage space for the projector to 'throw' the image big enough. That's the throw distance of the projector. There are long throw, short throw and ultra short throw projectors. Generally if you want an image that is 30 feet wide you need 30 feet plus (for long throw) or less than 15 feet (for ultra short throw). But there are some tricks to shorten the distance--use of mirrors, or use of multiple smaller projectors.
3) You need to decide what surface to use. You can use a screen or a scrim for projection. Large screens are expensive. There are screens for front projection and ones for rear projection. Then there are scrims. ...sharkstooth is only ok for front projection and is bad for rear projection....Chameleon scrim is good for both--not as good as a screen, but good if used properly. Note: With a scrim you should always project from an angle. This works in your favor with rear projection, because some of your throw distance can be from in the wings. Chameleon scrims can be rented or purchased for modest cost.

To read more, there are several calculators and more information 1/2 down this page that help you figure the number of lumens, the size of screen, viewing distance and the distance you have to put the projector back. (These are rough approximations which are very useful--and not available easily elsewhere).

If you want to talk about your project, message me or call.


The theater scrim people

Posted By: jayzehr
Date Posted: 2/17/14 at 6:37pm
Thanks Vicki.
As it turns out we're going to be using front projection using equipment that's already installed in the theater.

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