A – Aperture – The aperture is the hole inside the lens that allows light through. Aperture is measured in “f” numbers – a ratio of the diameter of the hole and the focal length of the lens. The size of this hole can be adjusted – a larger hole allows more light in, a smaller hole less. An important effect of this is the depth of field. A smaller hole produces a lot of depth of field. The reverse happens with a larger hole.

B – Blown Highlights – Blown highlights are areas of a photo that are so bright they are pure white.

C – Compact Flash (CF) memory card – A popular type of memory card. Used in digital photography to store images. The amount of memory per card varies. Popular memory capacities range from 256mb to 8GB. The larger capacity cards are really of use to professionals only.