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The lens in the copier does not need to be complex, because the systems are usually stopped down to small f numbers (e.g. for the Makinon Zoom Unit, f /16 at 1:1 magnification, falling to f /22 at 3:1 magnification), and the object and image distances are similar, so that many aberrations are minimized.
The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...
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The use of transparent sheets for overhead projection, called viewfoils or viewgraphs, was largely developed in the United States. Overhead projectors were introduced into U.S. military training during World War II as early as 1940 and were quickly being taken up by tertiary educators, [14] and within the decade they were being used in ...
Frames per second. Used in reference to maximum continuous shooting rate or video. [17] GIF: Graphics Interchange Format. A computer file format for coloured images, restricted to 256 colours and useful for small file-size. [8] GN: Guide number. A value indicating the power of an electronic flash apparatus, and used to estimate exposure. GN ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 January 2025. Art and practice of creating images by recording light For other uses, see Photography (disambiguation). Photography of Sierra Nevada Photography is the art, application, and practice of creating images by recording light, either electronically by means of an image sensor, or chemically ...