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2. Canon EF 50mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_50mm_lens

   Front and rear views of a Canon EF50mm f/1.4 USM. The EF 50mm lenses are a group of normal prime lenses made by Canon that share the same focal length.These lenses are based on the classic double-Gauss lens, [1] with the f/1.8 being a standard six-element double-Gauss with an air gap and powers between element 2 and 3 [1] and its faster cousins adding additional elements. [2]

3. Canon EF-M 32mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF-M_32mm_lens

   The EF-M 32mm f/1.4 STM is an interchangeable prime lens introduced by Canon in September 2018. The lens is based on the EF-M mount that is used in Canon's lineup of mirrorless cameras. It currently is the latest lens published that uses the EF-M lens mount. With a maximum value of f/1.4, it has the largest aperture of all Canon EF-M mount lenses.

4. Lens speed - Wikipedia

   en.wikipedia.org/wiki/Lens_speed

   A fast prime (fixed focal length) lens, the Canon 50mm f / 1.4 (left), and a slower zoom lens, the Canon 18–55mm f / 3.5–5.6 (right); this lens is faster at 18mm than it is at 55mm. Lens speed is the maximum aperture diameter, or minimum f-number , of a photographic lens .

5. f-number - Wikipedia

   en.wikipedia.org/wiki/F-number

   In the following quote, an "apertal ratio" of "1 ⁄ 24" is calculated as the ratio of 6 inches (150 mm) to 1 ⁄ 4 inch (6.4 mm), corresponding to an f /24 f-stop: In every lens there is, corresponding to a given apertal ratio (that is, the ratio of the diameter of the stop to the focal length), a certain distance of a near object from it ...

6. Canon Extender EF - Wikipedia

   en.wikipedia.org/wiki/Canon_Extender_EF

   The Canon Extender EF lenses are a group of teleconverter lenses made by Canon. These lenses are used between any compatible EF type lens and any of the Canon EOS line of cameras. When used with a compatible lens, they will multiply the focal length of the lens by a factor of either 1.4x or 2x, at the cost of decreasing the lens' aperture by 1 ...

7. 35 mm equivalent focal length - Wikipedia

   en.wikipedia.org/wiki/35_mm_equivalent_focal_length

   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 ...