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About Depth
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Photography which shows "depth of field" In optics, particularly as it relates to film and photography, the depth of field (DOF) is the portion of a scene that appears sharp in the image. Although a lens can precisely focus at only one distance, the decrease in sharpness is gradual on either side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions. For some images, such as landscapes, a large DOF may be appropriate, while for others, such as portraits, a small DOF may be more effective. In cinematography, a large DOF is often called deep focus, and a small DOF is often called shallow focus. The DOF is determined by the subject distance (that is, the distance to the plane that is perfectly in focus), the lens focal length, and the lens f-number (relative aperture). source: http://en.wikipedia.org/wiki/Depth_of_field

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