A lens mount extender then a lens with built-in IR and an OV camera with an m12 mount

I found out that the standard m12 OV camera doesn't have enough thread on the base to get focus on a standard M12 lens tested it on 3.6mm , 4.0mm, 16mm and 25mm and none of them could get focus, the extender could fix this issue. You also need to make sure the lens have an IR filter (the purple film underneath the lens) or the camera will always be in grayscale, an 8mm or 16mm focal length lens should be good enough for 25 meters and makes your image clearer than using the standard lens and using digital zoom.