| 摘要 |
PROBLEM TO BE SOLVED: To provide an ocular lens having a long eye relief, a wide viewing angle and a compact size, and high optical performance, and an observation device including the same.SOLUTION: An ocular lens includes, in order from an object side to an observation side: a first lens G1 having positive refractive power; a second lens G2 having negative refractive power; a third lens G3 having positive refractive power; a fourth lens G4 having negative refractive power; and a fifth lens G5 having positive refractive power. A focal length of the fifth lens is set to be shorter than a focal length of the third lens, and the focal length of the third lens is set to be shorter than a focal length of the first lens.SELECTED DRAWING: Figure 1 |
