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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.
Most modern lenses use a standard f-stop scale, which is an approximately geometric sequence of numbers that corresponds to the sequence of the powers of the square root of 2: f/ 1, f/ 1.4, f/ 2, f/ 2.8, f/ 4, f/ 5.6, f/ 8, f/ 11, f/ 16, f/ 22, f/ 32, f/ 45, f/ 64, f/ 90, f/ 128, etc.
In 1916, Northey showed how to calculate the angle of view using ordinary carpenter's tools. [2] The angle that he labels as the angle of view is the half-angle or "the angle that a straight line would take from the extreme outside of the field of view to the center of the lens;" he notes that manufacturers of lenses use twice this angle.
Flange focal distance. 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 on the usage and source) of a lens mount system is the distance from the mounting flange (the ...
Lens and ray diagram for calculating the circle of confusion diameter c for an out-of-focus subject at distance S2 when the camera is focused at S1. The auxiliary blur circle C in the object plane (dashed line) makes the calculation easier.
17.526 millimetres (0.6900 in) A C mount is a type of lens mount commonly found on 16 mm movie cameras, closed-circuit television cameras, machine vision cameras and microscope phototubes. C-mount lenses provide a male thread, which mates with a female thread on the camera.