接眼レンズ

Japanese Patent JP5853622

B2

PROBLEM TO BE SOLVED: To provide an eyepiece whose visibility can be adjusted and in which various aberrations such as a spherical aberration and a coma aberration are satisfactorily corrected.SOLUTION: An eyepiece comprises, in the order from an observation object side: a first lens group G1 having negative refractive power; a second lens group G2 having positive refractive power: and a third lens group G3 having negative refractive power. The second lens group G2 includes at least one aspherical surface, and by moving the second lens group G2 along an optical axis, visibility can be adjusted. The eyepiece satisfies conditional expressions (1): 0.25