I just built a photobooth with a Rebel T3 as my camera. My original plan was to just cut a hole in the box for the lens (I see a lot of DIY photobooth projects that do this), but I ended up just mounting the camera to the top of my booth. (This doesn't look as professional in my opinion, and I would LIKE to mount it internally.)
My concern is this: Doesn't the camera do some kind of light calibration before taking the shot? If I disable the flash, will the camera calibrate itself based solely on what it can see through the lens, or am I interfering with its operation in someway by covering the body of my DSLR in a dark box?