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Sharpness angle

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  • qalam — ▪ pen       ancient reed pen still used in Arabic calligraphy and formerly used for all writing. The qalam was cut from between two nodes of the stem of a reed chosen for its straight fibres. As thick as a finger and 8 or 10 inches (20 or 25 cm)… …   Universalium

  • photography, technology of — Introduction       equipment, techniques, and processes used in the production of photographs.  The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …   Universalium

  • Depth of field — The area within the depth of field appears sharp, while the areas in front of and beyond the depth of field appear blurry …   Wikipedia

  • Miniature faking — Digitally blurred miniature fake of Jodhpur Original p …   Wikipedia

  • Contax — II A historic camera: the East Germany Contax S of 1949 – …   Wikipedia

  • Grind — The grind of a blade refers to the shape of the cross section of the blade. It is distinct from the type of blade ( e.g. , clip point or drop point knife, sabre or cutlass, axe or chisel, etc.), though different tools and blades may have lent… …   Wikipedia

  • Visual acuity — 20/15 and 20/15 vision redirect here. For other uses, see 2020 (disambiguation). Typical Snellen chart used for visual acuity testing. Visual acuity (VA) is acuteness or clearness of vision, which is dependent on the sharpness of the retinal… …   Wikipedia

  • Optical aberration — v · d · e Optical aberration …   Wikipedia

  • Blade — For other uses, see Blade (disambiguation). Knife blades A blade is that portion of a tool, weapon, or machine with a cutting edge and/or a pointed tip that is designed to cut and/or puncture, stab, slash, chop, slice, thrust, or scrape animate… …   Wikipedia

  • Straight razor — A straight razor with square point and a double transverse stabiliser Main article: Razor A straight razor is a razor with a blade that can fold into its handle.[1] …   Wikipedia

  • Circle of confusion — For the closely related topic in microscopy, see Point spread function. In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. It is also known as… …   Wikipedia

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