How Tight Does Spandex Need To Be Stretched For Rear Projection? - AVS Forum
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post #1 of 7 Old 07-03-2013, 03:11 PM - Thread Starter
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I'm taking advantage of a couple days off and unseasonably cool weather here in Oklahoma to build a rear projection screen. I have a 9 x 5 spandex screen that I picked up for an experiment in outdoor use. It loses too much light for front projection, but it works well for rear projection. When I tried front projection, I had the 9 x 5 stretched really tight on a 120" x 68" frame. It was probably too much. I'm looking at a 110" screen to use in my back yard. Does it need to be BOC tight or just tight? Any help will be appreciated.
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post #2 of 7 Old 07-03-2013, 06:53 PM
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Just tight enough to get rid of any wrinkles, and provide a even surface. A single thickness of Spandex easily lets enough light pass through to be comparable to almost any Mfg Rear Projection screen

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post #3 of 7 Old 07-03-2013, 06:55 PM - Thread Starter
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Thanks MM. That's what I thought, just wanted to confirm.
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post #4 of 7 Old 07-07-2013, 05:39 AM
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The only major concern when going rear projection is the placement of the projector. Make sure that is under the bottom or top level of the screen to minimize or avoid seen a huge "hotspot".

Spandex for a rear projection screen works great.

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post #5 of 7 Old 07-07-2013, 06:39 AM - Thread Starter
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I got the screen built and we used it last night. Didn't go quite as big as I originally planned because I used material that I had on hand, so I ended up with an 82" screen. Screen frame is 1 x 4 poplar that I beveled on the inside edge (like a picture frame, and spandex is stapled to back side of frame) I built a "modesty panel" to block the projector light also. (The panel is removable) The advantage of the smaller screen is that it will be stored on the back wall of the garage where it can be used for front projection in case of rain. The cellphone pictures don't do it justice to the image, it looks great.





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post #6 of 7 Old 07-07-2013, 07:32 AM
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82" is still a "Big Arse" image, and combined with almost any normally priced PJ, comes at a considerable bargain compared to any similarly sized Flat Panel TV.

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post #7 of 7 Old 07-07-2013, 09:09 AM - Thread Starter
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This is a fairly inexpensive setup - $350 for the projector, (Epson Powerlite 707 = 2700 lumens, 3000:1), $45 for the RCA Blue Ray HTIB on craigslist (box was still sealed - I didn't ask!), $50 in lumber if I had to buy it, $55 for the screen material and $10 worth of black paint. $510 for 82" of 720p resolution outdoors. It's cheap at twice that price. I only used this projector because my wife's Epson Moviemate doesn't do rear projection.
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