Additional types of files may also be using the SCU file extension. If you are aware of any other file formats using the SCU file extension, please contact us so that we can update our information accordingly.
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.
Those interested in the minute details can read about Single-lens reflex cameras on Wikipedia. 1  Light passes through the lens and strikes a mirror (green) 2  The mirror reflects the light up to a focusing screen. 3  Light passes through the focusing screen and enters a block of glass called a pentaprism (orange)