Iso: The speed or specific light-sensitivity of a camera is rated by ISO numbers such as 100, 400, etc. The higher the number, the more sensitive it is to light. As with film, the higher speeds usually induce more electronic noise so the image gets grainier.
Diaphragm: a type of leaf shutter consisting of a number of thin blades which briefly uncover the camera aperture to make the exposure.
Speed Setting: The speed at which a digital camera's shutter exposes the image sensor to light.
Depth of Field: Depth of field describes the areas of the main focus point that remain sharp, or in focus. With an extremely shallow depth of field, even areas just in front of or behind that point will be out of focus. With a wide depth of field, much of the photograph may be crisply in focus. Depth of field is affected by factors such as aperture and focal length, although subject distance and sensor type can come into play as well.
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