Don t be a memory cheapskate

Buy the fastest memory cards you can afford to minimise the time it takes for your camera to write each shot to the media, and how long you ll have to wait before you can take the next shot. Wait too long and you ll miss something.
Cards are ranked using a simple class system, where the class number is simply the number of megabytes the card can store per second. So, your camera will be able to write to a Class 4 card at up to 4MBps, and a Class 10 card at up to 10MBps. Faster cards are more expensive, so if you re having trouble justifying to yourself the extra expense, compare them to the speed boost you get from upgrading the memory in your PC or Mac.