curtain shutter


noun Photography.

a focal-plane shutter consisting of a curtain on two rollers, moved at a constant speed past the lens opening so as to expose the film to one of several slots in the curtain, the width of which determines the length of exposure.

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Also called roller-blind shutter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020