So I am trying to figure out the best way to project videos onto an approximate 8 ft span of glass doors. I would like to conceal the projector from view of spectators while giving the brightest sharpest image. Thus a rear projection approach would hide the projector. The reason I am thinking about using an ultra short throw projector is that I wonder if I can mount the projector on the outside wall above the span of glass doors and thus hide even the appearance of the projector lens with its bright light source from viewers on the inside. Is there some reason that it is not recommended to use ultra short throw projectors onto rear projection films? The next question is can I apply the film to the inside (side with the viewers) or is there a reason the film must be used on the exterior surface (same side as the projector). Lastly, assuming that I can place the projector on the exterior wall above the glass doors, the exterior wall surface only extends perhaps 5" from the parallel surface of the glass (with projection film applied). Thus in order to get an approximate 100" image on the glass door span, I would need to install a motorized projector stand inside the wall which could extend the projector the required distance (maybe a foot or 1 1/2 feet) to get the desired 100" image even with an ultra short throw projector. Lastly I guess if I try to place an ultra short throw projector, I assume that I will need digital keystone adjustment if I place it a significant distance above the glass doors. The higher I move the projector above the glass doors, the more keystone adjustment I would need correct? Thanks in advance for any input.
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