Security camera appears normal day problem solving

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What should I do if the security camera is normal in the daytime, and the whole night becomes ambiguous?

The cause of the problem: the focal length and the azimuth of the camera have not changed, but the white daylight is small, the depth of field is large, the aperture is large at night, and the depth of field is small. The daytime gathers a clear position, and it may have fallen outside the depth of field at night, and this phenomenon is presented, which is caused by the change of the aperture, so this problem is generally presented on the camera of the active aperture.

Solution: After setting the camera to manual (electronic) aperture, adjust the lens to gather clearly, and then clear the camera to the “active aperture” form.

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