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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).
The Canon EF-S 18–55mm lens f / 3.5–5.6 is a Canon-produced wide-angle to mid telephoto zoom lens for digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 28.8–88mm, and it is a standard kit lens on Canon's consumer APS-C DSLRs.
The Canon PowerShot Pro1 is the first in the Canon PowerShot family of point-and-shoot cameras to have an L-designated zoom lens ranging from 7.2 to 50.8 mm, equal to 28 to 200 mm in 35mm equivalent focal length. Its maximum aperture changes from f / 2.4 to f / 3.5, with focus driven by an ultrasonic motor.
It is praised as "one of the best general/multi-purpose lenses available", [1] [2] and ideal for available light photography on a Canon APS-C camera. [3]The fast f / 2.8 aperture, combined with 3-stop image stabilization, makes the 17–55 very useful in low light compared to an unstabilized f / 3.5–5.6 Canon EF-S 18–55mm lens, which is a frequent kit lens, and thus the 17–55 is much ...
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 ...
The Canon EF-S lens mount is a derivative of the EF lens mount created for some Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras with the EF-S mount are backward compatible with the EF lenses and, as such, have a flange focal distance of 44.0 mm. Such cameras, however, have more clearance ...
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