| 单词 | at infinity |
| 释义 | > as lemmasat infinity b. Geometry. Infinite distance, or that portion or region of space which is infinitely distant: usually in at infinity. In Photography also used of any distance, or the range of distances, at which an object is effectively in focus when the lens is set for the greatest possible distance. ΘΚΠ the world > space > distance > [noun] > infinite distance infinity1867 the world > relative properties > number > mathematical number or quantity > [noun] > infinity > infinite distance infinity1867 the world > relative properties > number > geometry > geometric space > [noun] > infinite distance in infinity1867 society > leisure > the arts > visual arts > photography > action of taking photograph > technical factors > [noun] > type of focusing depth of field1855 circle of least confusion1867 flatness of field1867 infinity1867 register1890 fixed focus1892 back focus1897 circle of confusion1906 isocentre1931 split-field1941 split-image1950 1867 T. Sutton & G. Dawson Dict. Photogr. 122 In every lens there is..a certain distance of a near object from it, between which and infinity all objects are in equally good focus. 1873 B. Williamson Elem. Treat. Differential Calculus (ed. 2) xiii. §192 A system of parallel lines may be considered as meeting in the same point at infinity. 1873 B. Williamson Elem. Treat. Differential Calculus (ed. 2) xiii. §195 The ordinary parabola..[has] the line at infinity for an asymptote. 1885 C. Leudesdorf tr. L. Cremona Elements Projective Geom. 221 Suppose the four tangents to be parallel in pairs..then one diagonal will pass to infinity. 1910 Photogr. for Beginners (Country Life Ltd.) ii. 13 These are called ‘fixed focus’ cameras, and the lens is ‘set at Infinity’, which means that, provided the object to be photographed is not nearer the camera than, say, twenty feet, everything in the picture will appear sharp. 1929 R. H. Goodsall Beginner's Guide Photogr. v. 22 The next thing is to adjust the lens to correct focus... All subjects over 100 feet away will be at ‘infinity’, smaller distances are marked on the scale. 1939 J. M. Blair Pract. & Theoret. Photogr. ix. 89 The hyperfocal distance is the least distance at which a lens may be focussed when objects at infinity are still in focus. 1950 G. L. Wakefield Your Camera Lens & Shutter ii. 27 In photography, an object at 100 feet away from the lens would be normally considered as being at infinity. Infinity cannot be rigidly defined in the photographic sense, but it becomes a greater distance as the focal length of the lens increases. 1974 Trafford Catal. Spring & Summer 890/1 Kodak 100 pocket camera outfit. Fine 3-element lens gives sharp colourful prints or slides from 4 ft. to infinity. < as lemmas |
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