focal distance (
61Affine focal set — In mathematics, and especially affine differential geometry, the affine focal set of a smooth submanifold M embedded in a smooth manifold N is the caustic generated by the affine normal lines. It can be realised as the bifurcation set of a… …
62Optimum HDTV viewing distance — is the distance that provides the viewer with the optimum immersive visual HDTV experience. Although opinions vary on the exact screen size to distance relationship, formal research and recommendations suggest closer is preferred to further[not… …
63Least distance of distinct vision — The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. In optometry, the least distance of distinct vision (LDDV) or the reference seeing distance (RSD) is the closest… …
64SAARC Consortium on Open and Distance Learning — The SAARC Consortium on Open and Distance Learning (SACODiL) is a regional cooperation agency set up under the auspices of the South Asian Association for Regional Cooperation (SAARC) with the objectives of promoting cooperation and collaboration …
65principal distance — A standard by which photographic print is measured in terms of the focal length of the camera used at the time of film exposure. It is said to be of the same length as the focal length. Such a standard applied to an enlarged, reduced, or shrunken …
66calibrated focal length — kalibruotasis židinio nuotolis statusas T sritis Gynyba apibrėžtis Židinio nuotolio vertės ekvivalentas, apskaičiuotas taip, kad būtų išlyginti teigiami ir neigiami fotoaparato iškraipymo dydžiai visame jo lauke (negatyvo plokštumoje).… …
67nominal focal length — nominalusis židinio nuotolis statusas T sritis Gynyba apibrėžtis Apytikris židinio nuotolis, suapvalintas iki kokio nors standartinio skaičiaus, vartojamas lęšiams, veidrodžiams arba fotoaparatams klasifikuoti. atitikmenys: angl. nominal focal… …
68equivalent focal length — ekvivalentiškas židinio nuotolis statusas T sritis Gynyba apibrėžtis Atstumas, matuojamas pagal optinę ašį nuo užpakalinio lęšio mazginio taško iki fotoaparato plokštumos, kurioje fotografuojamo objekto (vietovės) vaizdas yra tiksliausias.… …
69hyperfocal distance — /huy peuhr foh keuhl, huy /, Photog. the distance, at a given f number, between a camera lens and the nearest point (hyperfocal point) having satisfactory definition when focused at infinity. [1900 05; HYPER + FOCAL] * * * …
70source-skin distance — (SSD) the distance from the focal spot on the target of the x ray tube to the skin of the subject, as measured along the central ray …
