Select either RAW mode (check your camera manual to see how) or JPEG with the highest possible resolution and the lowest possible compression rate. RAW files use much more memory than JPEG files, regardless of whether your camera uses CF, SD, xD, or Memory Stick cards.
CF = CompactFlash, SD = Secure Digital, SDHC = Secure Digital High Capacity. These are the most common memory card technologies in current use.
Using Histograms as an Exposure Aid
Correct exposure is the key to great photos. Overexposure should be avoided at all costs, as washed-out highlight detail cannot be recovered at any stage during the workflow.
Digital image ...