| 摘要 |
During the focal length change, two lens groups are simultaneously moved with mutually constant spacing. One group is of small importance for the magnifying change, and both have a sharpness adjustment sensitivity with different signs. The sharpness adjustment sensitivities meet the specified formulae related to the sharpness adjustment sensitivities of both lens groups during the tele-limit adjustment. Such that 12 /!K~b/!. Pref. the two groups also meet a further formula related to their sharpness adjustment sensitivities, where -0.5/ K~a/K~b-0.1.
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