Calculation formula for lens focal length

The lens focal length covering the photographed can be calculated by the following formula. F = V * D / V (1) f = h * D / h (2) f: lens focal length V: shooting the vertical direction height of the scene H: Take the length of the scene in the scene of the scene D: the distance to the shooting scene v: Vertical direction height of the camera picture H: The horizontal direction of the camera picture (1) Measurement shooting scene height 1/2 camera (picture size) V = 4.8mm Shooting scene vertical direction height v = 330mm (33cm) lens to the photographing scene distance D = 2500mm (250 cm) to formula (1) = 36mm (2) Measurement of the case of shooting scene length 1/2 camera (picture size) h = 6.4mm Shooting the horizontal direction of the scene Length H = 440mm (44cm) lens to the shooting the distance D = 2500mm (250cm) Equation (2) It can be seen that f = 36mm Note: When the actual application, the value derived from the V and H of the field may be different, and the value should be taken, thereby obtaining a large field of view. Technology area Huawei and Telus completed North America's first 5G CPE friendly user test High-precision check implementation of power measurement device Xu Wei: How to break the development bottleneck in the test measurement industry? Provide one-stop solution Fei Cao Electric Products boarded the quality inspection and black list, the development of the lack of lack of the development The new Chinese Fluke Process Instrument Division website will be officially launched on January 20, 2018!

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