How to adjust the lens if you want to very closer object, say 4 inches?
Step1: Open the glass cover:
Step2: Find the locks and slots nearby the black lens:
Step3: Release the lock and separate the black lens cover from the base, then unscrew the lens and turn the lens to adjust it.
Step4: View it on the monitor until you are happy with it, and complete the adjustment procedure and cover the glass on the camera. The camera is ready to install.