【problem causes】
Under extremely low illumination at night, the image noise is relatively large, because the object can not be seen clearly, it feels like "blur", and there is no problem in actual focusing.

【Solution】

In extremely low illumination environments, it is recommended to add supplementary light or choose infrared devices; if the illumination is not very low, for network devices, you can try to access the camera on the web and adjust the noise reduction level parameters under the [Image] menu appropriately.