Mark's setup is very attractive, and cleverly done. Also very little sound from the projector is going to make in through the wall. However there is another consideration: Will you be able to adjust the picture from behind the wall without making a thousand trips around to see the screen or without an assistant? I would recommend a separate viewing port for this purpose, or making a large enough window to allow looking over the top of the projector from behind. Just a thought.
I started with a hole similar to Mark's installation. In fact, Mark's DIY was my inspiration and starting point. However, the hole became problematic when I wanted to use the Panamorph. The whole idea is to have the projector out of sight for noise and aesthetic purposes. The hole that I originally made for the projector lens would not work with the Panamorph. I ended up making an 8x10 opening to install a piece of non-reflective optical glass in the wall and I have the projector and the Panamorph behind the glass. It works great and gives me the freedom to easily adjust the lens and projector, if necessary. The glass looks cool too (not that I care about such things). Finally, and most importantly, my wife approves.
I cut a 4" hole and slipped a recessed can light trim in the hole painted to match the walls. The can trim has the black baffle attached so the projector is about 3" back from the front of the wall. The end result is an opening about 3" wide.
I do have to run back and forth to adjust the projector initially but once it is set, it never moves so I have been quite satisfied with the end result.
I will try to attach a photo below but I have not had much success doing this before so no guarantee
I project through a hole trimmed with recessed light trim. I set up the picture using my video camera on a tripod in front of the screen connected to a TV which is with me behind the wall. When I do fine focusing, I move the camera very close to the screen. One problem I'm having, though, is with my new projector and a Panamorph. With the Panamorph and projector behind the wall, the hole isn't big enough. I'm going to try it with the Panamorph in front of the wall and see what happens.
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