AMOLED Stands for active-matrix organic light-emitting diode. A new type of display technology used in mobile devices and televisions, and in the monitors of some digital cameras. Has several advantages over LCD, including using less power. Aperture Behind the lens of your camera is a movable circular iris which opens and closes to control the amount of light falling on the sensor. This is usually controlled by the light meter, although some cameras have a manual aperture control. Altering the aperture also changes the depth of field. Artefacts When an image is stored in your camera's memory it has to be compressed to fit, usually into a JPEG file, and in the process some information is inevitably lost. When the image is uncompressed for viewing, noise creeps in and appears as angular blocks in the image, which are known as artefacts. Autofocus Almost all digital cameras have automatic focusing. There are essentially two types: contrast detection, used in compact cam
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