Selecting a Reverse Camera?

So you want to select a reverse camera, but don't know what you should be looking for? Here are some things I've considered before getting one myself. Please feel free to comment.

Criteria	Description
CCD or CMOS?	Charged Couple Device (CCD) and Complementory Metal Oxide Semi conductor (CMOS) are two available camera types. CCD gives better/cleaner images and so tend to be slightly more expensive (but not a lot). They tend to give better resolution as well
Viewing angle	Naturally, the larger the viewing angle, the better chance of capturing items that could potentially hit your vehicle when reversing. Generally, a viewing angle over 140 degrees would do. Some cameras may give you a fish eye type effect which I personally am not a fan of.
Water proof	Its vital that the camera is water proof ! Sure, none of them are truly water proof, but more like water resistant. But given the rough weather it goes through, its best that the camera is water proof
Embedded versus Fixed	Embedded is where the camera is actually fitted into the bumper of the vehicle. You might want to consider what would happen if the camera goes bad, and you need to replace - what if you can't find the same size/model? Also centering the camera is crucial. On the other hand, the models that are fixed to the license plate can easily be replaced
Night vision	True night vision does work if the camera has infrared lights. You do get some cameras that work quite well though, despite not having night vision LEDs. Also, having light emitting from the vehicles reverse lights does help.(If you have modified the reverse lights to include different coloured lights, you might want to consider the infrared night vision cameras)
Adjustable	By adjustable, I mean the ability to change the (horizontal)viewing angle. Some cameras come as fixed, which might be give an awkward angle (or may not be as helpful as it can be)
Anti fog	This is a nice to have feature. Doesn't really affect me, so the camera I have is not antifog. I've occasionally had to wipe the camera off though. So it might be worth considering. I believe they have a coating of some chemical on the camera lens to avoid fogging
Front /Reverse camera	Be careful when buying either, as they aren't quite the same. The (proper) reverse camera inverts the picture horizontally so that it matches your viewing perspective. A front camera doesn't do this. In other words, you may think you have an object on your right, but its actually on your left.
Guiding lines	Some camera's have two lines indicating the rough distance between you and the objects behind you (See Image)
Guidelines are displayed automatically, to gauge your vehicle position.