Focus
The focus of the image in the microscope is done by separating the object to be studied from the objectives. By means of rings (1 and 2) the stage can be raised and lowered to find the focus (in old microscopes the stage remains fixed, with the objectives moving). In this microscope there is a "macro" lens with a sharp movement (1), to approximate the focus, and one, called "micro" (2), to adjust it.
The focus operation requires following certain steps to perform it safely. The correct procedure is as follows. Looking outside the microscope, the objective is taken next to the preparation and then looking through the eyepiece, it is slowly separated until the image is obtained. If focus is sought by bringing the objective closer to the preparation, there is a risk of producing fractures (in the preparation or, worse still, in the front lens of the objective) if we go beyond the plane of focus.

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