Definition: An optical system which concentrates light rays from a wide source into a narrow beam. Condensers are used in spotlights and enlargers.
Definition: A lens or lens system used in an enlarger or slide projector to concentrate light from the lamp source and focus it evenly on the negative or slide.
Definition: A lens or lens system used in an enlarger or slide projector to concentrate light from the lamp source and focus it evenly on the negative or slide.
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