Leica DM IRB manual Electronic focus, Controls of the electronic focus are

Electronic focus

The electronic focus offers the user the follow- ing advantages:

–Extremely sensitive focusing, especially for high magnifications.

–Fine focusing selectable in 4 steps; coarse focusing can be switched on “blind” at any time.

The stepwidths desired by the user (corre- sponding to gear ratio and sensitivity) are allocated to every single objective and automatically reset as soon as the particular objective is used.

–Fast lowering of the objective nosepiece and exact repositioning to the previously set focal plane.

–Electronic parfocality of all objectives through intelligent linking of motorized objective nose- piece and electronic focus drive.

The controls of the electronic focus are:

–The focusing handwheels, conventionally positioned on both sides of the microscope.

–Two keys (focus keys) for fast lowering of the objective nosepiece and returning to the focal plane. The keys are in a convenient position in front of the right handwheel.

If both focus keys are pressed simultaneously, coarse focusing is switched (SC). The coarse focus is switched off again the moment that the two keys are pressed simultaneously again, or a different focusing speed is switched with the STEP key.

–Key for switching the focusing speed (“STEP”, S0 = 0.05 μm, S1 = 0.1 μm, S2 = 0.7 μm, S3 = 1.5 μm) on the front of the microscope.

The micrometer values always indicate the smallest stepwidth that can be carried out.

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