Aspects of Camera Lenses: Anterior Surface
Camera lenses are complex pieces of machinery composed of autofocus motors, mechanical rings, a few lenses (to create a compound lens), an aperture and lots more. Lenses function according to the physical law of optics. When we refer to our lenses, such as a 50mm or a zoom lens, we are referring to the whole lens unit.
The Anterior Surface
Anterior surface refers to the outer most piece of glass on the lens. This is the part of the lens that is furthest away from the photographic medium. It is through here that the light first enters through the lens on it's journey to becoming a photograph. This piece of glass is also most susceptible to damage and should be protected.
If it becomes scratched, it may become necessary to replace the entire lens, as the scratch will be visible in all the photographs that are taken. To help prevent the anterior surface from being scratched, one can purchase a UV filter for about $15 to cover the lens. Thus, any damage sustained happens to the filter and not the lens.
Anterior surface is a name that comes from anatomy. It refers to the cornea, the outer most layer of the eye.