Ashley

you need to work on your english there mate cameras are mounted on a vehicle. just worried about them leaking through the lens adjustment part. the rest i can seal up. well, the camera should have a rubber stopper to fill the hole which is for adjusting the lens.

Hello there, I worked in IR PTZ cameras 4 years. This problem is the lens angle is too big, it doesn't match the IR LED lights.

"covered in water and mud" tells us the gasket borken or the house-self problem.

Hello there, "IR 3.6mm 1/3" DN 520 tvl" does this camera have infrared LED lights? If yes, the led lights bad quality make face turn white too much to see clearly. Another, you want to cover 20meter, 3.6mm lens is too short. You must to use 6mm lens.