| 释义 |
anastigmatic, a.|ænəstɪgˈmætɪk|
[f. an- 10 + astigmatic a.; cf. G. anastigmatisch and stigmatic a. 9.]
Not astigmatic; free from astigmatism: applied to a compound lens so constructed as to correct the astigmatic aberration.
1890P. Rudolph Brit. Pat. 6028 1 It is..necessary to choose the ratios of the single lenses..in such a manner that the opposed astigmatic differences are of the same magnitude, in view of attaining compensation of this astigmatism, or anastigmatic correction of the entire objective. 1893Year-Bk. Photogr. 10a (Advt.), Zeiss' Patent Anastigmatic Lenses..are the result of calculations with the new Jena Glass. 1897Outing (U.S.) XXX. 340/2 The lens must be one of the almost faultless anastigmatic type. 1901Brit. Jrnl. Photogr. 22 Nov. 744/1 The anastigmatic flatness of field. 1902[see stigmatic a. 9]. 1953Electronic Engin. XXV. 138/1 Anastigmatic lenses are employed in this unit so that a high degree of optical accuracy is obtained. |