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The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.
Etched grid lines, compare with Type E; prisms at shallower angle than Type A, intended for slower lenses (maximum aperture > f /2.8). S Ground matte Fresnel Horizontal split-image rangefinder, 3 mm diameter Intended for use with MF-10/-11 data backs, includes rectangular area at left side of frame masked by memo plate; compare with Type A T (TV)
Prism name Digonal prism (Trigonal) Triangular prism (Tetragonal) Square prism Pentagonal prism Hexagonal prism Heptagonal prism Octagonal prism Enneagonal prism Decagonal prism Hendecagonal prism Dodecagonal prism... Apeirogonal prism; Polyhedron image ... Spherical tiling image Plane tiling image Vertex config. 2.4.4: 3.4.4: 4.4.4: 5.4.4: 6.4 ...
This specifies the part of the prescription designed primarily to improve far vision. In a bifocal lens, this generally indicates what is to be placed in the top segment. NV is an abbreviation for near vision. This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens.
A ray trace through a prism with apex angle α. Regions 0, 1, and 2 have indices of refraction, , and , and primed angles ′ indicate the ray's angle after refraction.. Ray angle deviation and dispersion through a prism can be determined by tracing a sample ray through the element and using Snell's law at each interface.
SLRs designed for amateurs and consumers generally use APS-C sensors, which are significantly smaller than 35 mm film frames and these require either their own specialist lenses or accepting a change in equivalent focal length and field-of-view angle when using lenses designed for the 35 mm format (wide-angle lenses become normal, normal become ...
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