Lens Telescope Zoom

Zoom-lens reflex camera - Zoom lens reflex might refer to an SLR (or dSLR) type camera with a zoom lens which can not be removed. No such camera currently exists, as all fixed lens cameras either use an electronic viewfinder (EVF), or a separate optical finder.

Zoom lens - A zoom lens is a mechanical assembly of lenses whose focal length can be changed, as opposed to a prime lens, which has a fixed focal length. They are commonly used with still and video cameras, some binoculars and telescopes, and other optical instruments.

Canon EF 28-135mm lens - The Canon EF 28-135mm lens is a standard zoom lens with image stabilization (IS) technology and a high zoom ratio made by Canon. The lens is based on the EF Lens Mount and will work with all film and digital EOS cameras that support this mount.

Prime lens - In film and photography, a prime lens is a photographic lens whose focal length is fixed, as opposed to a zoom lens, which has a variable focal length. Prime lenses are not as versatile as their zoom counterparts, but are often of superior optical quality and lower cost.

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