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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. 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 .

4. Camera lens - Wikipedia

   en.wikipedia.org/wiki/Camera_lens

   The camera equation, or G#, is the ratio of the radiance reaching the camera sensor to the irradiance on the focal plane of the camera lens. [8] The maximum usable aperture of a lens is specified as the focal ratio or f-number, defined as the lens's focal length divided by the effective aperture (or entrance pupil), a dimensionless number. The ...

5. Canon RF lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_RF_lens_mount

   Canon full-frame cameras have used the EF lens mount since 1987. In comparison with that mount, the RF mount's inner diameter is the same at 54 mm. [1] The RF mount's flange focal distance at 20 mm is much shorter than that of the Canon EF and EF-S mounts at 44 mm.

6. Canon A-1 - Wikipedia

   en.wikipedia.org/wiki/Canon_A-1

   Canon A-1 with a FD 50/1.8 Viewfinder of a Canon A-1. The right number is the current F-number (1.8), meaning that the aperture is fairly wide open. The left number (45) indicates the approximate shutter speed of 45 −1 s (the camera can select odd shutter speeds, but does not display them)

7. Pentax DA 50mm lens - Wikipedia

   en.wikipedia.org/wiki/Pentax_DA_50mm_lens

   The SMC Pentax-DA 50mm f/1.8 lens is a normal prime lens for the Pentax K-mount. The 75mm equivalent focal length on APS-C cameras and fast f/1.8 aperture make it well suited for portrait photography. It uses a simple double-Gauss design of 6 elements in 5 groups.