High Definition 650-1300mm Camera Lenses With Telephoto Zoom Lenses fo

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High Definition *******0mm Camera Lenses With Telephoto Zoom Lenses for Canon EOS **0D

A zoom lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed focal length (FFL) lens (see prime lens). They are commonly used with still, video, motion picture cameras, projectors, some binoculars, microscopes, telescopes, telescopic sights, and other optical instruments.

A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. A lens that loses focus during zooming is more properly called a varifocal lens.

Jilin Dongya Optical Group of China, we are the manufacturer of camera lenses, such as Wide Angle, Telephoto, Fisheye Lenses etc. And we are the OEM supplier for Vivitar, Sakar, Opteka, Polaroid and Neewer.