What size image do you need? How bright does the projector need to be to retain its quality and still present a clear image. Where is the projector being positioned? Once you have decided on a projector you can then begin to determine where it will need to be installed. The throw will provide you with the information you need to determine where that projector will be placed.
Throw is the measurement used to determine how faraway a projector should be placed to present the best quality image. It is measured in Height and Length of the room. Different projector models require different distances based on what they are projecting on. Most manufacturers will give you a throw chart for a projector. Eiki offers a calculator that can be found on their website. (Choose the projector you are interested in then choose "Lens calculator" from the top menu options.)
Short throws are used to describe small spaces and close-up range. Sometimes it is used to describe a high end projector with a specific lens for a desired throw.
Large throw is used when a throw is beyond the standard throw such as for a smaller screen with a long distance.
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