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<blockquote data-quote="LensWork" data-source="post: 5326" data-attributes="member: 1283">Here's the brief explanation of depth-of-field (DOF):Depth-of-field is the portion of a scene, from near to far, that appears acceptably sharp in the image. Although a lens&nbsp; can precisely focus at only one distance, the decrease in sharpness is&nbsp; gradual on each side of the focused distance, so that within the DOF,&nbsp; the unsharpness is imperceptible under normal viewing conditions.The shorter the focal length of the lens, the greater DOF (i.e. an 18mm lens will have greater DOF than a 200mm lens, at the same focused distance &amp; same aperture)The smaller the aperture, the greater the DOF (i.e. f/16 gives greater DOF than f/2.8)The greater the focused distance, the greater the DOF (i.e. Focusing at 20 feet gives greater DOF than focusing at 3 feet)So, as an example, an 18mm lens @ f/16 focused at 20 feet would yield tremendously greater DOF than a 200mm at f/4 focused at 6 feet.And no, filters do not have any effect on DOF.</blockquote>

[QUOTE="LensWork, post: 5326, member: 1283"] Here's the brief explanation of depth-of-field (DOF): Depth-of-field is the portion of a scene, from near to far, that appears acceptably sharp in the image. Although a lens can precisely focus at only one distance, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions. The shorter the focal length of the lens, the greater DOF (i.e. an 18mm lens will have greater DOF than a 200mm lens, at the same focused distance & same aperture) The smaller the aperture, the greater the DOF (i.e. f/16 gives greater DOF than f/2.8) The greater the focused distance, the greater the DOF (i.e. Focusing at 20 feet gives greater DOF than focusing at 3 feet) So, as an example, an 18mm lens @ f/16 focused at 20 feet would yield tremendously greater DOF than a 200mm at f/4 focused at 6 feet. And no, filters do not have any effect on DOF. [/QUOTE]

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