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.
1 Misspelling of lens.  When a lense is described as of 4 inch focus, it means that such a lens is capable of bringing parallel rays to a point at a distance of 4 inches from the lens. Basically, a beam of light passing through a lens parallel to the optical axis converges to form a focused image on the film.