What is a (D)SLR? The Single Lens Reflex is so named because it has a mirror (and a single lens). But to really understand how the SLR got its name it’s important to go back to the days before it existed.
Before the [35mm] SLR became popular, there was the Rangefinder cameras (that used an optical viewfinder and a rangefinder mechanism to determine when the lens was in focus) and the Twin Lens Reflex camera (that had two lenses, one to view the image on a screen by way of a mirror, and a second one to record the picture).
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