Polar vision mixer

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This article is about a piece of equipment. For more information on what it is for or how to use it, try its documents wiki article.
Polar vision mixer

4 inputs and a black source. Preview and programme outputs. Much luma keying, no chroma keying.

Until 1997Unverified or incomplete information it always had a worrying rattle, this was resolved by drilling the heads off the security screws and emptying out a loose nut, and replacing the screws with slot heads.

Vision mixer in use