Do You Need a Big Image in a Small Room?
Short-Throw Projectors
Finally, consider whether you need a short throw—meaning the ability to cast a given-size image at a short distance from the screen. Short-throw projectors let you throw a large image in tight spaces, and also minimize the risk of people getting in front of the projector and blocking part of the image.
Ultra-Short-Throw Projectors
There are no universally accepted definitions for what counts as a short throw, but as an example, while most projectors can throw an approximately 6-foot-wide image from roughly 12 to 15 feet away, most short-throw projectors need 3 to 6 feet, and ultra-short-throw projectors generally need less than a foot.
Down sides of short-throw, and especially ultra-short-throw, projectors are that they are more expensive than traditional models with long-throw lenses, and they tend not to do as well in large conference rooms and small auditoriums. They also require a very flat and stable screen, or the image may suffer some distortion.
