This worked perfectly! I purchased a 25ft (72″wide) roll of screen from Home Depot and some 1″ PVC pipe/elbows. I threw together a 120″x 68″ frame when I got to location and clamped on the screen with 2″ spring clamps. I used additional spring clamps to clamp the frame to some light stands from my Lowell kit. After sandbagging down the stands we went around and stretched out the screen until all the wrinkles were gone. Below are some stills of the background with/without the screen and then the finished product. Thanks!

