Exif is a standard for extensions to JPEG for use in digital cameras. The files you read from your camera will look like regular JPEG (.jpg) files but contain extra information defined by this standard. Exif also only allows certain types of JPEG options. The extra information in the file relates to picture taking conditions, camera settings, color encoding information, sounds recorded when the picture was taken, and Global Positioning System (GPS) information, if supported by extra hardware. The Exif standard was developed by the Japanese Electronics Industry Development Association (JEIDA) and is currently in version 2.1.

Most of the power used by a digital camera is used to run the LCD display on the back of the camera. If you can, avoid or limit use of the LCD display. The batteries will last a lot longer. Using a memory card reader will also help to save your batteries, especially if you use a slow connection like RS232 serial. Some brands of batteries do not work well in the high-drain conditions of a digital camera and will seem to be dead after a short period of use (ironically they can then be used to power children's toys or other devices for a long time!)

Use batteries that a designed for use in high-drain devices or special 'photo batteries'. Battery manufacturers are aware of these problems and change their designs for these applications. Some cameras can use rechargeable batteries and although expensive can save a lot of money in the long run if you take a lot of pictures. Low temperatures affect the performance of some batteries. If you plan to take pictures in sub-zero conditions, try to keep the camera (and hence the batteries) warm; perhaps by keeping it in your pocket.