Mind Your Shadows
Mind Your Shadows You can usually avoid shadows in front projection by mounting the projector on a ceiling, using a laser pointer to point to the screen (instead of trying to point with some physical object, like your arm, getting between the projector and the screen), or both. In a small conference room, however, positioning a standard throw projector to avoid shadows may mean putting it relatively close to the screen and living with a smaller image than you'd like. Choosing a short throw projector can usually solve that problem. If it doesn't for a given room, an ultrashort-throw projector should certainly solve it.Avoiding shadows can also be a problem in other situations. A projector setup that works for a presentation, for example, with only one person needing to point things out on the screen, may not work well if the image is something like an architectural drawing, that everyone in the room needs to point to and discuss. Similarly, you may need a display in, say, a reception area, where people will be standing up and walking around, and can easily cast shadows. 2. Look Ma, No Shadows One way to avoid any possibility of shadows is to put the projector in back of a translucent rear-projection screen. The problem with rear projection is that you need enough room behind the screen for the projector to throw the size image you want. For a standard or even a short-throw projector, that works out to a lot of dead space behind the screen. For an ultrashort-throw projector, however, all you need is to wall off a small part of a room, or, better yet, put the projector in a small recess in the wall behind the screen.
1. Projectors Aren't Just for Presentations