| 摘要 |
A compact eyepiece is disclosed for use with an objective lens in a microscope, binocular, telescope, etc., that favorably corrects optical aberrations over a sufficiently wide apparent field of view and that offers an eye relief that is larger than the focal length of the eyepiece. The eyepiece comprises, in order from the objective side, a negative first lens group G1 and a positive second lens group G2. The second lens group has an objective-side focal plane situated between the first lens group G1 and the second lens group G2. The second lens group G2 comprises, in order from the objective side, a first lens subgroup G21 having positive refractive power and comprising a positive lens element G21A and a positive cemented lens G21B, and a second lens subgroup G22 having positive refractive power and comprising a positive lens element. The eyepiece satisfies certain quantitative conditions.
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