Patent ID: 7825360

Claim:
An optical apparatus provided with an objective with a correction collar for correcting an aberration due to an error in an optical thickness of a sample holding member, said optical apparatus comprising: an optical thickness detecting unit which detects the optical thickness of the sample holding member; an operating unit which calculates an amount of drive of the correction collar for correcting the aberration, based on the optical thickness of the sample holding member detected by the optical thickness detecting unit; a driver unit which drives the correction collar, based on the amount of drive of the correction collar calculated by the operating unit; a focusing mechanism which changes a distance between the objective and a sample; an image sensor which forms an image of the sample that passes through the objective; and an identifying unit which identifies characteristic information about the objective, wherein the operating unit calculates the amount of drive of the correction collar for correcting the aberration, based on a database or function characteristic to the objective identified by the characteristic information and based on the optical thickness of the sample holding member which is detected by the optical thickness detecting unit.