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Question:

What is F1.2 F on the camera lens? What is the parameter, 1.2 and what are the parameters

What is F1.2 F on the camera lens? What is the parameter, 1.2 and what are the parameters

Answer:

This is the aperture of the aperture, in the camera device, F or F stands for the aperture, and the larger the number is the smaller the diameter of the aperture
The illumination of the image is proportional to the square of the relative aperture of the lens, which is generally used to represent the size of the lens aperture in terms of F = F/D, the inverse of the relative light diameter. The smaller F is, the larger the aperture, the greater the light flux to the CCD chip. So in the case of the same focal length f, the smaller f is, the better the camera is.
In order to control the size of the light flux through the lens, the aperture is set at the back of the lens. Assumes that effective aperture of aperture for d, because of the light refraction, the actual effective aperture is d, bigger than d, d is defined as relative aperture and focal length f A, namely A = d/f, relative aperture of lens decided by camera illumination

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