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What does SLR mean in photography? It stands for Single Lens Reflex It is a type of camera that uses 1 lens. A long time ago they used cameras with 2 lenses, 1 to see thru and 1 to take the picture with, but noâ¦w they use cameras with 1 lens to do both.
In this post I explain the optics of an SLR and compare it to viewfinders from mirrorless cameras. A single-lens reflex camera uses a mirror (hence the term reflex) and a pentaprism that allows the photographer to look through the lens and see exactly what will be captured in the photograph. A digital single lens reflex camera is a camera that combines the optics of an SLR with a digital imaging sensor.