The camera in the iPhone 3GS has been upgraded to a 3-megapixel sensor with full autofocus and auto-exposure controls. These tips will help you get the most out of it...

Tapping the screen to set the autofocus on a subject also sets the exposure levels. So be careful if you click on a dark area when there is bright light or sky in the background as it will be overexposed.

You can add geo-tagging to the photographs you take with the camera. This will enable you to plot your photographs against geographic locations in websites like Flickr and applications such as iPhoto.

To make sure your photos are tagged you have to enable Location services: click on Settings then General then make sure Location Services is switched on.

The iPhone 3GS camera also has a Macro Mode. This is activated automatically and allows you to focus on objects that are between 4 to 8 inches away. Just point at the close-up subject and click on it on the screen to set the macro autofocus and exposure (see example image below).

If you use the camera a lot it may be a good idea to add it as a double-click shortcut to the Home button. Go to Settings, then click General then click on Home. Select Camera - now when you double-click the Home button the camera will launch!

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