Formula to find focal length
https://www.omnicalculator.com/other/focal-length
1 The typical focal length formula looks as follows:1/Focal length = 1/Image distance + 1/Object distance,where:Image... 2 Image distance and Object distance are given in mm. 3 And here's the transformed equation that we use:Focal length = (Object distance / ( (1 / Magnification) + 1)) 4 Object distance is given in mm; and 5 Magnification does not have a unit. 6 In order to copy the lens magnification calculator, you'll need... Know the size of the sensor or the image, either in mm or pixels. Know the angle of the FOV, either in degrees or radians. Use the formula: Focal length = (Sensor size / 2) / tan (FOV / 2), where tan is the trigonometric function tangent. Alternatively, you can use the formula: Focal length = (Sensor size x Working distance) / FOV, where Working distance is the distance from the lens to the object.
Know the size of the sensor or the image, either in mm or pixels.
Know the angle of the FOV, either in degrees or radians.
Use the formula: Focal length = (Sensor size / 2) / tan (FOV / 2), where tan is the trigonometric function tangent.
Alternatively, you can use the formula: Focal length = (Sensor size x Working distance) / FOV, where Working distance is the distance from the lens to the object.
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