Part I this monograph describes a photo-electric lens test bench capable of measuring lenses of focal length from 12mm to 1m. Designed specifically for Television applications, it gives the 'optical ...

Photo: Sony Lens names can be quite complicated, with some brands including every detail about the lens in their name.

When light moves from air into glass or plastic it is refracted close refractionProcess by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, eg a light ...