Microscope objective and microscope observation system

A microscope objective, comprising:

• a first movable lens group that is movable along an optical axis;
• a first correction means configured to move the first movable lens group along the optical axis to correct axial chromatic aberration;
• a second movable lens group that is movable along the optical axis;
• and
• a second correction means configured to move the second movable lens group along the optical axis to correct spherical aberration,
• wherein the first movable lens group is composed of a cemented doublet with a plano-convex lens and a plano-concave lens, and
• the plano-convex lens and the plano-concave lens satisfy following conditional expressions (1) and (2):
• ❘
• "\[LeftBracketingBar]"
• n
• 1
• -
• n
• 2
• ❘
• "\[RightBracketingBar]"
• <
• 0.05
• ;
• (
• 1
• )
• ❘
• "\[LeftBracketingBar]"
• v
• 1
• -
• v
• 2
• ❘
• "\[RightBracketingBar]"
• >
• 10
• ;
• (
• 2
• )
• n1:
• refractive index of the plano-convex lens on a reference wavelength;
• n2:
• refractive index of the plano-concave lens on the reference wavelength;
• v1:
• Abbe number of the plano-convex lens;
• v2:
• Abbe number of the plano-concave lens.