Towen7 said:
Sure... retractable screens are more prone to waves than a fixed screen but I've seen lots and lots of non-wavy ones.
The Draper Salara Plug 'n Play unit (with Draper AT1200 screen material) in my main theatre is nothing but perfectly flat and rock steady.
It's intended to be wall mounted but since I wanted it out in front of my centre speaker stack I sketched up a simple ceiling bracket design that gave me a wall-like surface to attach the Salara to. Basically an "L"-shaped piece of metal that mounts to the ceiling in the joist with a vertical slot on it's face piece, that the Salara's mounting brackets bolt to.
Had I had a 45 degree ceiling I would have simply adjusted the bend from 90 degrees to either 45 degrees or 135 degrees depending on which way I wanted it to sit on the "ceiling."
The salara's own brackets latch on to a track/rail that runs its whole length, so I could make sure that my brackets hit a ceiling joist, and kept the screen centred right where I wanted it. As it is, one bracket is close to the right end and the other is a 1/4 to a 1/3 in from the left side.
Jeff