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A zoom lens is a system of camera lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed-focal-length (FFL) lens . A true zoom lens or optical zoom lens is a type of parfocal lens, one that maintains focus when its focal length changes. [1]
The Canon EF 75–300mm f / 4–5.6 III lens. Introduced in 1991, the Canon EF 75–300mm f / 4–5.6 lens is a telephoto zoom lens for Canon EOS single-lens reflex cameras with an EF lens mount. There are 3 basic types of the lens: the IS USM (Image Stabilization, Ultra Sonic Motor), the USM (USM, no IS) and non-USM (no USM, no IS).
The Canon EF 28–90mm f / 4–5.6 is a full frame SLR zoom lens, also often included as a kit lens with Canon EOS film cameras. The maximum aperture is f / 4 at 28mm, reducing to f / 5.6 at 90mm. When set to 90mm, this will create a moderate amount of background blur for portrait photography. There are several versions of this lens.
The Nikon AF Zoom-Nikkor 35–70 mm f / 3.3-4.5 is one of Nikon's zoom lenses for the 35mm format. The combination of low cost and convenience makes this a popular lens among many photographers . Nikon AF Nikkor 35-70 mm 1:3.3-4.5 (I) Lens Nikon AF Nikkor 35-70 mm 1:3.3-4.5 (I) Lens
The 18-55mm f / 3.5-5.6G AF-S Zoom-Nikkor lens is a midrange zoom lens manufactured by Nikon for use on Nikon DX format digital SLR cameras. Often included as a kit lens on entry-level DSLRs, it also can be purchased separately from the camera body. Nikon first introduced the lens in 2005 and has provided five subsequent updates.
The increasingly popular 20-50mm zoom range is arguably more versatile than the more established 16-35mm lenses and shares the minimum 2.5× optical zoom ratio of 28-70mm lenses but shifted to a wider field of view.