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The shades are marketed as suitable for both men and women and are available in an assortment of styles and colors. Depending on the design, shutter shades may not function as sunglasses; although some models contain UV resistant lenses, many do not. The horizontal plastic "shades" neither provide protection for the eye from UV light nor ...
Focal-plane shutters may also produce image distortion of very fast-moving objects or when panned rapidly, as described in the Rolling shutter article. A large relative difference between a slow wipe speed and a narrow curtain slit results in distortion because one side of the frame is exposed at a noticeably later instant than the other and the object's interim movement is imaged.
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For many years, reliable focal-plane shutters were very expensive and SLRs equipped with Compur or Prontor leaf shutters were strong competitors. [152] [153] As FP shutters improved, their faster available speeds won out in the late 1960s and leaf shutter 35 mm SLRs disappeared around 1976. [154] [155] 1953
Shading coefficient (SC) is a measure of thermal performance of a glass unit (panel or window) in a building. It is the ratio of solar gain (due to direct sunlight) passing through a glass unit to the solar energy which passes through 3mm Clear Float Glass. [ 1 ]
Sunglasses may be worn for aesthetic purposes, or simply to hide the eyes. Examples of sunglasses that were popular for these reasons include tea shades and mirrorshades. Many blind people wear nearly opaque glasses to hide their eyes for cosmetic reasons. Many people with light sensitivity conditions wear sunglasses or other tinted glasses to ...