Because of the functional relationship, my lens must be extended to another watertight compartment. The distance is about 30 cm. I use two adapters for the FPC to control cable (pictured), but the picture becomes very dark and needs to be very The strong light can get to the image, the normal connection is brighter, but I think it is still worse than the USB lens. I used a low-light USB lens, which is very bright. Is there any way to improve this problem?