Single-lens Reflex Definition

Of or being a reflex camera in which a movable mirror allows the photographer to see the image in the viewfinder exactly as it will be recorded.
American Heritage
A reflex camera having a viewing system that allows the photographer to see the subject through the same lens that brings the image to the film or digital sensor.
Webster's New World

Origin of Single-lens Reflex

  • From single +"Ž lens (contrasted against a twin-lens reflex camera, TLR), and reflex (“reflection"), the principle by which the image path is diverted.

    From Wiktionary

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