| 摘要 |
1,050,055. Photographic objectives. NIPPON KOGAKU KABUSHIKI KAISHA. Sept. 1, 1965 [Sept. 4, 1964], No.37341/65. Heading G2J. A photographic objective of focal length#, particularly for micro-copying at a magnification of <SP>1</SP>/ 25 th, comprises firstly a negative meniscus L 1 concave to the object, secondly a lens L 2 , thirdly cemented lenses L 3 , L 4 , L 5 , fourthly a lens L 6 , fifthly cemented lens L 7 , L 8 and lastly a positive meniscus L 9 concave to the image, with at least three of the second to fifth components inclusive being convergent and wherein:- Optical data are given for two examples of the objective shown. |
