| 摘要 |
1,012,524. Photographic objectives. R. RODENSTOCK, [trading as OPTISCHE WERKE G. RODENSTOCK]. Feb 27, 1963 [March 28, 1962], No. 7949/63. Heading G2J. The objective has an aperture ratio higher than 1:1 preferably 1:0. 75 and consists of a single front convergent element, a cemented convergent meniscus with a divergent interpass r4 of a power more than 0.02 times the power of the objective, the refractive indexes of the glasses meeting at this surface differing by at least 0.06, a cemented divergent miniscus with a convergent interface r7 of a power more than 0.05 times the power of the objective and of a radius less than the focal length, and a rear convergent doublet with a convergent interface r10. Optical data are given for the example shown. |
