| 释义 |
anastigmat Photogr.|ænəˈstɪgmæt|
[a. G. anastigmat (Miethe), back-formation from anastigmatisch adj.: see next.]
An anastigmatic lens or system of lenses.
1890Brit. Jrnl. Photogr. 19 Sept. 604/2 Doublet Anastigmat, No. 102, by Carl Zeiss Jena. 1894Amer. Ann. Photogr. 100 The Anastigmat..is the most rapid lens I have tried. 1902Westm. Gaz. 23 June 8/2 All scientists have declared it impossible to construct a true Anastigmat lens without the aid of the Jena glass. 1908Ibid. 6 June 14/2 The best lens for copying purposes is..one of the flat field anastigmats. 1957Amos & Birkinshaw Television Engineering I. ix. 187 For lens combinations it [sc. elimination of curvature of field] can be achieved, if the lenses are separated, by correct choice of lens constants. A lens combination thus corrected is termed an anastigmat. |