| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnifier optical system capable of obtaining plural virtual images equal or approximate in diopter and different in magnifications in the same visual field. SOLUTION: This system is provided with a master magnifier lens system and an auxiliary positive lens system. The system is constituted so that a change in the composite magnification with the auxiliary positive lens system may be simultaneously viewed in the apparent visual field of the master magnifier lens while leaving the magnification of the master magnifier lens system.
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