The D5000 features a flip-down LCD screen so you can always see what you are shooting, an improved 11-point autofocus system, and it takes 12.3 megapixel images.
To capture posed portraits and shots of children, a high-end SLR with optical stabilization features and center point autofocus will render crisp, clear images.
The combination of precision nine-point autofocus and 63 zone metering also provides consistent digital photographs across a wide variety of light conditions.
The first most obvious and genuinely literal interpretation is that the letters are an acronym for Canon's "Electrical Optical System" autofocus.
The Apple iPhone 3G only has a two-megapixel camera and no flash, but this was upgraded to a 3MP autofocus camera for the iPhone 3GS.
The two-megapixel fixed focus camera on the existing iPhone 3G was upgraded to a three-megapixel autofocus camera on the iPhone 3GS.
It also features a camera on the back of the phone with a 5 megapixel sensor with autofocus, an HD camcorder, and LED flash.
Some of the best cameras on smartphones today are eight-megapixels with autofocus and 720p HD video recording capability.
Canon added a larger baseline sensor for enhanced precision in the camera's center-point autofocus capabilities.
Many people say that they are happy with the five-megapixel autofocus camera on the iPhone 4 as well, which can record 720p HD video at 30 frames per second.