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Huaqiang Security Network News ]
The telephoto zoom lens refers to the time when the lens is changing and the market angle is the smallest, that is, when the lens is changed until the viewing image is enlarged to the maximum.
For example, the focal length of a 100x lens is f8.5-850mm. Then, when the focal length of the lens reaches f850mm, the same image will be viewed the most, and the viewing angle will be the smallest. f850mm is the longest focal length of the lens.
Advantages of large multiple lenses
Different lens magnifications of the same focal length determine that the viewing angle of the lens is different. A lens with a large multiple is better than a lens with a small multiple, and it is easy to find the target.
For example, the camera is also viewed with a 1/3" target. When the short focus of the lens is 10 mm, the viewing angle of the lens is about 30 degrees. When the focal length of the lens is 30 mm, the angle of the lens is only 10 degrees. When the focal length of the lens is 100 mm, the market angle of the lens is only about 3.3 degrees. The narrow viewing angle makes it difficult to find the target. The high-power lens ensures the viewing angle of the lens while ensuring the lens focal length is long, which is more convenient for the viewer. Quickly find the target.
How often do we say that the zoom lens is how many times?
The focal length of the zoom lens, in addition to the focal length of the short focal length of the lens, is called the multiple of the lens.
For example, the focal length of the zoom lens is 8.5mm-850mm, then the focal length of this lens is 850/8.5=100, and the multiple of the lens is 100 times.
What is the change of the zoom lens?
The zoom lens can be changed as long as it refers to the 3 places of the lens -----
1: The magnification of the lens can be changed - the lens can enlarge or reduce the image
2: The aperture of the lens can be changed---the lens's sensitivity to light can be changed.
3: The focus of the lens can be changed - the lens can have a virtual change at the same focal length
Lens common phenomenon solution
No image after lens installation
1: Check the camera, if the monitor is powered, check if the lines are connected.
2: Check if the lens aperture is closed.
3: Check if the rear working distance of the lens and the camera are the same, --- the interface form is the same.
4: Check if the camera's driving mode is supported. Some cameras only support video drivers.
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