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Category: Video Lingo

Throw Ratio

Throw Ratio – A formula used to calculate how far a projector needs to be away from the screen and is usually determined by screen width. For example, if a projector lens has a 1.5 – 2.5 throw ratio then the projector needs to be between 1.5 and 2.5 times the screen width away. So, on a 10’ wide screen the projector would need to be 15’ – 25’ away from the screen.

Tape Op

Tape Op – A video technician who manages all video playback and recording for a show (even though it rarely involves tape anymore). In addition to playing video clips at the right times and making sure the event is properly recorded, a tape op will also view all clips to check for errors and get run times, and will call the “out” (how much time is remaining in any playback) to the rest of the technical staff.


Switcher – A device with multiple video inputs that is used to select what is seen on a screen or multiple screens. A switcher can also use video effects and transitions and be used to layer graphics and combine other video sources. Some switchers are very basic while others are very complex and powerful.