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According to CIPA guidelines, [2] 35 mm equivalent focal length is to be calculated like this: "Converted focal length into 35 mm camera" = (Diagonal distance of image area in the 35 mm camera (43.27 mm) / Diagonal distance of image area on the image sensor of the DSC) × focal length of the lens of the DSC.
Numerical aperture of a thin lens. Numerical aperture is not typically used in photography. Instead, the angular aperture of a lens (or an imaging mirror) is expressed by the f-number, written f/N, where N is the f-number given by the ratio of the focal length f to the diameter of the entrance pupil D :
List of ultrafast lenses. Some of the fastest camera lenses in production as of 2021 were as follows: Cosina Voigtländer Super Nokton 29 mm / 0.8. Cosina Voigtländer Super Nokton 29mm f / 0.8 Micro Four Thirds mount; Cosina Voigtländer Nokton 10.5mm, 17.5mm, 25mm, 42.5mm, 60mm f / 0.95 for Micro Four Thirds mount
Camera lens focal lengths are usually specified in millimetres (mm), but some older lenses are marked in centimetres (cm) or inches. Focal length (f) and field of view (FOV) of a lens are inversely proportional. For a standard rectilinear lens, FOV = 2 arctan x / 2f, where x is the width of the film.
Angle of view can also be determined using FOV tables or paper or software lens calculators.
Flange focal distance. Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance ( FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance ( FBD ), flange focal length ( FFL ), back focus [1] or register, depending ...
Hyperfocal distance. Minox LX camera with hyperfocal red dot. Nikon 28mm f/2.8 lens with markings for the depth of field. The lens is set at the hyperfocal distance for f/22. The orange mark corresponding to f/22 is at the infinity mark ( ∞ ). Focus is acceptable from under 0.7 m to infinity.
The crop factor is sometimes referred to as "magnification factor", [5] "focal length factor" or "focal length multiplier". [6] This usage reflects the observation that lenses of a given focal length seem to produce greater magnification on crop-factor cameras than they do on full-frame cameras.
A zoom lens is a system of camera lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed-focal-length (FFL) lens . A true zoom lens or optical zoom lens is a type of parfocal lens, one that maintains focus when its focal length changes.
194 × 245 mm (image area) 312.5 mm. 300 mm. For a 35mm camera with a diagonal of 43mm, the most commonly used normal lens is 50mm, but focal lengths between about 40 and 58mm are also considered normal. The 50mm focal length was chosen by Oskar Barnack, the creator of the Leica camera. [16] [17]