| 摘要 |
The observation apparatus of the present invention has a basic structure as a normal microscope with an objective system constituted by an interchangeable objective unit attached to a revolver and a tube lens unit fixed at a position to which a light beam is guided from the objective unit. Particularly, the observation apparatus has a mechanism capable of setting a special optical system (auxiliary lens unit) constituting part of the objective unit on the optical axis of the objective system between the revolver and the tube lens unit. A partial objective unit constituting part of the objective unit is attached to the revolver to constitute the objective unit by the partial objective unit and the auxiliary lens unit. In this manner, the objective unit for a very low magnification whose total length is larger than the parfocal distance for the objective in this apparatus can be constituted.
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