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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]
In order to more easily compare lens–camera pairs, it is common to use their 35 mm equivalent focal length. For example, when talking about a 14 mm lens for a Four Thirds system camera, one would not only indicate that it has a focal length of 14 mm, but also that its "35 mm equivalent focal length" is 28 mm.
Focal Length Aperture intro OSS Zeiss/G/ G Master Lens Wgt ⌀ Length Min Focus Mag Filter Size Model Notes 14mm: f / 1.8 2021 No G Master 460g 83mm 99.8mm 0.25m 0.10 N/A SEL-14F18GM Uses gel filters behind the rear element. 20mm: f / 1.8 2020 No G 373g 73.5mm 84.7mm 0.18m 0.22 67mm SEL-20F18G 24mm: f / 1.4 2018 No G Master 445g 75.4mm 92.4mm 0 ...
35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...
Optically designed as a reverse telephoto to enable the lens to fit into a standard mount as the focal length can be less than the distance from lens mount to focal plane. Long-focus lens - a lens with a focal length greater than the diagonal of the film frame or sensor. Long focus lenses are relatively simple to design, the challenges being ...
Many lens manufacturers produce or produced prime lenses at or near the following focal lengths: 20 mm, 24 mm, 28 mm, 35 mm, 40 mm, 50 mm, 85 mm, 105 mm, 135 mm, 200 mm, 300 mm, 400 mm, and 600 mm. For these lengths many manufacturers produce two or more lenses with the same focal length but with different maximum apertures to suit the ...
Different kinds of camera lenses, including wide angle, telephoto and speciality. A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses (compound lens) used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.
The 1.5 indicates that the angle of view of a lens on the camera is the same as that of a 1.5 times longer focal length on a 35 mm full-frame camera, which explains why the crop factor is also known as a focal-length multiplier. For example, a 28 mm lens on the DSLR (given a crop factor of 1.5) would produce the angle of view of a 42 mm lens on ...