This matches our dash mount AHD dash monitor with our AHD twin lens reversing camera. AHD offers higher resolution images and better night vision. The monitors use a high brightness 1024 x 600 panel with wide viewing angles. The system is for use both reversing and for continuous rear view. It has a trigger wire which if connected to the reversing light will bring up the reversing camera automatically. It should be noted that AHD systems switch slower than the standard CVBS ones. We make a rough estimate that it takes around 3 seconds to switch. The monitor will accept both CVBS and AHD cameras and you can mix them.
The following pictures show screen shots of this system in various situations. We use a mobile phone for these pictures as they seem to offer the best results. One problem we come across is you get "interefernce patterns" on the photograph that are not there on the actual monitor. Also the night views tend to be a little more blurred than the actually are. The results though will give an impression of what you will see.
This image is from the wide angled lens for reversing. There is a bicyle rack on our test vehicle which obstructs the view to a degree. With the camera mounted about 7.5 feet above the ground you can see the full width of the vehicle plus at least 2 feet either side. If you enlarge the image you can see the rubber bump stop on the corner near the kerb. AHD gives good colours and the tendency of some cameras to turn the grass purple is cured.
This image shows the day view using the narrow angle lens of the reversing camera. We have these made with the narrowest lens that fits the camera body to give the best impression of distance. Wide angled lenses tend to make objects close in look much further away.
For many people the night vision is very important. The image above shows the wide angled camera in use on a street with rather poor street lighting. The vehicle lights are on, but the reversing light is not. We find at night it is best to turn the brightness down on the monitor although the mode button controls various lighting options. The image produced is very clear and takes any guesswork out of reversing.
On this image we were out on a night with no moonlight. The location chosen was as far away from light as we could find. This image was obtained in an area of total darkness with no vehicle lights on.
