I am looking at getting mt first front projector. The main use will be for dvd. However I would want to use it for 4:3 material too. Instead of buying a motorized screen. Could two manual screens be placed in front of each other? That way I could just use the appropriate screen for what I am watching. The projector I am looking at is the panasonic PT-500U. It lists similar throw distance's for the size screens I would use.The projector has a manual zoom lens, which I'm guessing is going to be the problem.