A lenss is optical lens or assembly of lenses utilized in conjunction with a camera body and mechanism to create pictures of objects either on photographic material or on alternative media capable of storing a picture with chemicals or electronically.

There is no major distinction in theory between a lens used for a still camera, a video camera, a telescope, a magnifier, or alternative equipment, however the careful style and construction square measure completely different. A lens is also for good fastened to a camera, or it's going to be interchangeable with lenses of various focal lengths, apertures, and alternative properties.

Here are some video lens manufacturing process

See also:
New Nikon D600 Specifications
New EOS 700D Kit (EF S18-55 IS STM)