| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens meter capable of measuring a focal length of a thick lens. SOLUTION: A conventional lens meter aims at the measurement of a focal length on a rear side of the lens. A plurality of parallel luminous flux projection means from the oblique direction are added thereto, and an image formation position of luminous flux from them when the thick lens is put is compared with that when the thick lens is not put to calculate a real focal length in order to constitute this lens meter.
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