Nikon eclipse e100 Manual de instruções - Página 19

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Using the Working Distance for Focusing

Each objective has its working distance indicated on its side. The working distance is the

distance between the front of the objective and the specimen when the specimen image is in

focus. If you have difficulties in focusing with the standard procedure described on p. 16, try

one of the following methods using the working distance for focusing.

Method 1:

While looking at the microscope from the side, rotate the coarse focus knob to bring the

specimen close to the objective. When the distance between the specimen and the front of the

objective becomes slightly smaller than the working distance, take your hands off the coarse

focus knob. The specimen is now almost in focus. Look into the eyepieces and rotate the fine

focus knob in the direction that lowers the stage.

Raise the stage until this

distance is slightly smaller

than the working distance.

Method 2:

Swing the 40x objective into the optical path. While looking at the microscope from the side,

rotate the coarse focus knob until the specimen almost touches the objective (about 0.5 mm

apart from the front of the objective). The specimen is now almost in focus. Switch to the 10x

objective, look into the eyepieces, and rotate the fine focus knob slightly to find the focal point.

Be careful not to hit the objective with the specimen.

Lower the stage with the fine

focus knob to find the focal

point.