Some great responses here. One thing to remember is that the digital PJ's do not beam the image straight ahead, they actually offset it upwards. This is so you can sit it on a coffee table for example,and the image will be above the coffee table. Usually the lens is approx at the bottom of the image. This is important because if you angle the PJ, the image gets out of shape, the bottom being wider than the top. This can be corrected by a "keystone" adjustment, but it is advisable to not use it, since it is digital and will markedly decrease image quality.
Ok, if you want to mount the PJ in the back of the room, near the ceiling, you will probably want to hang it. When hung, the PJ is actually upside-down, so the image will now be BELOW the lens. This helps to center the image on the wall. Once again, you want to avoiding tilting the PJ any more than absolutely neccesary due the the keystone problem.
Ok, if you want to mount the PJ in the back of the room, near the ceiling, you will probably want to hang it. When hung, the PJ is actually upside-down, so the image will now be BELOW the lens. This helps to center the image on the wall. Once again, you want to avoiding tilting the PJ any more than absolutely neccesary due the the keystone problem.