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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.
3 Answers 3. The mm of a lens is the focal length. To take close-up shots of things far away, you need a long focal length, which means high mm. An entry or mid-level Canon camera has an APS-C sized sensor. The sensor size is really what determines what the meaning of the focal length is â focal length and sensor size together give you angle of view.