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.
Report Abuse. 100-300mm refers to the focal length of the lens, in this case it's a varibale focal length lens or, more commonly, a zoom lens. Focal length is the distance from the optical center of the lens to the focal point (or the point of focus). On a camera the focal point is the film plane or the digital sensor.