Olmypus Corporation

Masahiro Sakakura

Kenichiro Abe

Takashi Kasahara

Hirokazu Konishi

Yuso Fujita

An objective includes a first lens group that has a positive refractive power and a second lens group that has a negative refractive power. The objective includes a first negative lens and satisfies0.005&#x2264;&#x2264;0.1&#x2003;&#x2003;(1)0.005&#x2264;&#x2264;0.72&#x2003;&#x2003;(2)10 mm&#x2264;&#x2264;100 mm&#x2003;&#x2003;(3)0.1&#x2264;&#x2264;31&#x2003;&#x2003;(4)when dis a thickness of the first negative lens, his an axial marginal ray height on a lens surface on the object side of the first negative lens, his a minimum value of an axial marginal ray height in the second lens group, his a height of an axial marginal ray on a lens surface of the objective that is situated closest to the image side, L is a length of the objective, and f is a focal length of the objective.

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Tokyo, Japan

Masahiro Sakakura