aperture plate

noun

Definition of aperture plate

: a smooth plate that establishes the film plane in a motion-picture camera or projector and that has a rectangular opening defining the margins of the picture area as recorded or projected

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“Aperture plate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aperture%20plate. Accessed 15 Jan. 2021.

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