Originally Posted by thachertom
Does anyone have any ideas how I could DYI a projection screen that allows the image to simultaneously be viewed from either side of the screen? This is not for a home theater but rather for use at a family reunion where I want to project photos and have them be viewable from both sides of a banquet room from a central point, rather than only projecting against one wall on the far side of the large room. I know that such screens exist and can be purchased but as this is really for a one-time use, I need a less expensive alternative.
Welcome to AVS.
Here is a thread related to spandex screens http://www.avsforum.com/avs-vb/showthread.php?t=1228287
Can tell you first hand experience that works great, specially for a one time use. However, ambient light, like with any projector, is a factor on the side that the image is being projected onto. If you use the screen for a rear projection, if you limit or have no light on the rear side, you could have ambient light on the front side and the image would still be acceptable, this is one of the advantages of rear projection.
Now if you want to see the image on both sides ambient light comes into play plus the consideration mentioned above.
If you consider a spandex screen, the more cotton the fabric has the better, also there are 4 way stretch and 2 way stretch fabrics.