| 单词 | flat field |
| 释义 | > as lemmasflat field flat field n. Photography (see quots. 1904 for flat-back n., 1918). ΘΚΠ society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [adjective] > types of lens flat field1841 wide-angle1865 slow1867 wide-angled1873 fast1877 rapid1878 fish-eye1882 sharp1883 symmetrical1890 telephotographic1891 telephotographic lens1891 narrow-angle1893 stigmatic1896 tele-negative1898 tele-positive1898 bloomed1945 soft1945 wide-field1950 1841 R. Hunt Pop. Treat. Art of Photogr. 80 A photographic camera should possess, according to Sir John Herschel, ‘the three qualities of a flat field, a sharp focus,..and a perfect achromaticity’. 1871 Eng. Mechanic 24 Mar. 22/1 It will give abundance of light, but not a flat field. 1878 W. de W. Abney Treat. Photogr. 205 Since the manufacture of non-distorting doublets giving a fairly flat field has been perfected. 1893 Jrnl. Soc. Arts 41 384/2 The efforts of opticians..are being continually put forth in the direction of the attainment of..as near approach as possible to a ‘flat field’. 1904 G. F. Goodchild & C. F. Tweney Technol. & Sci. Dict. 226/1 A lens is said to give a flat field when the image of a distant object is equally in focus, whatever part of the screen it occupies. 1918 Photo-Miniature Mar. 20 Flat field, applied to a lens which, when photographing a flat subject, e.g., a painting, gives equal definition in all parts of the plate. 1966 M. LaCour & I. T. Lathrop Photo Technol. x. 115/1 Enlarging lenses are designed to produce an extremely flat field. < as lemmas |
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