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Troubleshoot/What Is Focal Length Aperture Gain Angle of View
What is Focal Length, Aperture, Gain, Angle of View?
Focal Length
- The focal length of a lens is the distance, in millimeters, between the sensor (focal plane) and the optical center of the lens. It is not a measurement of the actual length of a lens, but a calculation of an optical distance from the point where light rays converge to form a sharp image of an object to the digital sensor or 35mm film at the focal plane in the camera. The focal length of a lens is determined when the lens is focused at infinity.
The focal length tells us the angle of view—how much of the scene will be captured—and the magnification—how large individual elements will be. The longer the focal length, the narrower the angle of view and the higher the magnification. The shorter the focal length, the wider the angle of view and the lower the magnification.
