Network camera can not get good focus, what should be done?
WH network camera Troubleshooting
The focus of network camera might not be correctly adjusted for the line of sight. Please adjust the focus manually as described in Adjust Camera Focus.
There is no adaptor fitted with your C-mount lens. If you have previously changed the supplied CS-mount lens, you may have unintentionally installed a C-mount lens without fitting the adaptor first.