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There is no precise definition of the term, but lenses marketed as "standard zoom" usually cover a range of at least 30mm to 70mm in terms of 35mm equivalent focal length with an optical zoom ratio of 2.5× (e.g. 28-70mm) to 5× (e.g. 24-120mm) — the most common being 3× (e.g. 24-70mm). [1]
This list covers optical lens designs grouped by tasks or overall type. The field of optical lens designing has many variables including the function the lens or group of lenses have to perform, the limits of optical glass because of the index of refraction and dispersion properties, and design constraints including realistic lens element center and edge thicknesses, minimum and maximum air ...
The resulting images from 50 mm and 70 mm lenses for different sensor sizes; 36x24 mm (red) and 24x18 mm (blue) In photography , the 35 mm equivalent focal length is a measure of the angle of view for a particular combination of a camera lens and film or image sensor size .
Original file (1,266 × 2,100 pixels, file size: 1.34 MB, MIME type: application/pdf, 7 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Three 50 mm prime lenses from Minolta with different design parameters. The left lens with lens speed 3.5 is for macro photography, where lens speed is of less concern. The middle one has lens speed 1.7, such a type comes as standard with many SLRs. The right lens has lens speed 1.2 and thus enables shorter shutter speeds in the same light ...
Zoom lenses are often described by the ratio of their longest to shortest focal lengths. For example, a zoom lens with focal lengths ranging from 100 mm to 400 mm may be described as a 4:1 or "4×" zoom. Typical zoom lenses cover a 3.5× range, for example 24–90 mm (standard zoom) or 60–200 mm (telephoto zoom).
Whereas the 600 is a fixed-lens camera, equipped with the Mamiya 127 mm lens, the 600 SE is fitted with an interchangeable lens mount similar to the Mamiya Press line; however, only three lenses were made (75 mm, 127 mm, and 150 mm, sharing their optical design with their Mamiya Press counterparts) that cover the full Polaroid Type 100 frame ...
(a digital camera with an image sensor which size is similar to 35 mm film in film cameras as the standard film camera format) [2] The vast majority of video and still cameras use lenses that produce nearly rectilinear images. A popular alternative type of lens is a fisheye lens which produces a distinctly curvilinear, wide-angled result.