Introduction to common sense knowledge of camera lens purchase

October 12, 2023

[ Huaqiang Security Network News ] Nowadays, more and more people like cameras very much . Gradually, cameras have become a kind of product that consumers can't put down with. They can take pictures of everything they like and scenes to commemorate for their own memories. It used to be beautiful, but because the lens of the camera has a certain service life, the lens used for the camera will be replaced regularly, but this is the key. How can I choose a good lens for the lens change? A lot of people don't know how to choose a shot. In fact, it's not too difficult to teach you a few small things.

1. The imaging size of the lens should be consistent with the size of the CCD target surface of the camera. As mentioned above, there are 1 inch, 2/3 inch, 1/2 inch, 1/3 inch, 1/4 inch, 1/5. Inches and other specifications.
2. Resolution of the lens The intrinsic indicator of the quality of the lens is the optical transfer function and distortion of the lens. However, for the support, only the spatial resolution of the lens needs to be understood, and the number of black and white stripes that can be resolved per millimeter is measured. Unit, the formula is: lens resolution N = 180 / height of the format format. Since the camera CCD target size has been standardized, such as a 1/2 inch camera, the target surface is 6.4 mm wide by 4.8 mm high, and the 1/3 inch camera is 4.8 mm wide by 3.6 mm high. Therefore, for a 1/2-inch format CCD target, the minimum resolution of the lens should be 38 pairs of lines/mm. For a 1/3-inch format camera, the resolution of the lens should be greater than 50 pairs of lines, the target of the camera. The smaller the face, the higher the resolution of the lens.
3. Lens focal length and field of view angle Firstly, according to the distance from the camera to the monitored target, the focal length of the lens is selected. After the lens focal length f is determined, the field of view is determined by the camera target.
How is it easy? But here to tell everyone about the lens of the camera, if you usually take care of yourself, pay attention to cleaning when you are not careful. [Fire security network: Xiao Xu]
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