A photo comparisons from all iPhone version cameras (First generation iPhone, iPhone 3G, iPhone 3GS, iPhone 4, the new iPhone 4S), a point & shoot camera, the Canon S95 ($500), and a professional dSLR, the Canon 5DMKII ($4000+) in two situations: 1. A macro setting to test detail and quality of the cameras; 2. A backlit skyline shot.

Learn Photography: Online SLR Camera Simulator!

stolencamerafinder uses the serial number stored in your photo to search the web for photos taken with the same camera.

By constantly saving the previous few seconds of video before you hit record, Precorder lets you wait until something interesting happens to start recording, and you'll never miss a precious moment or get stuck with hours of boring video to painstakingly edit down.

One hotly anticipated feature rolling out in next week's iOS 4.1 update is the new HDR (high dynamic range) option in the iPhone's built-in Camera app. The results are subtly improved and realistic looking photos, as opposed to the fake, over-processed look that is often the hallmark of HDR.

The only rule in photography is that there are no rules. However, there are many composition guidelines which can be applied in almost any situation, to enhance the impact of a scene. Below are ten of the most popular and most widely respected composition 'rules'.