Nikon SMZ25 Instruction Manual page 89

1 Check that the optical path of the tube is 100% to the binocular part.
2 Using coarse control, lower the zooming body to a position near the working distance.
[Working distances of objectives]
0.5x： 71 mm
1x： 60 mm
1.6x： 30 mm
2x： 20 mm
3 Using fine control, precisely focus on the sample.
 Torque of the focus knobs
For the P2-FU Focus Unit and P2-FMDN Focus Mount, the
torque of the coarse focus knobs can be changed. To do this,
turn the torque adjustment ring on the base of the left coarse
focus knob using the hex driver (nominal designation, 2:
supplied with the focus unit). Adjust the torque to an
appropriate level.
Notes on the torque adjustment
When the torque is too low, the zooming body may slide down due
to the various loads it carries, such as its own weight or the load of
the counterbalance spring inside the focus unit. This may result in
injury, such as pinching fingers between the objective and sample,
or cause damage to the sample or objective.
Note that turning the fine focus knob will cause the coarse focus
knob to also turn, changing the torque of the fine focus knob.
 Focusing stroke
• P2-FU Focus Unit
Focusing stroke:
Stroke per rotation of the focus knobs
• P2-MFU Motorized Focus Unit
Focusing stroke:
• P2-FMDN Focus Mount
Focusing stroke:
Stroke per rotation of the focus knobs
Useful functions for focusing
When using the P2-MFU Motorized Focus Unit, the remote control enables the following remote operations: changing the
focus speed, setting the limit position, setting retracting, and resetting Z. For details, see Chapter 8, "2.2 P2-MFU
Motorized Focus Unit."
* Also see Chapter 8, "2 Focus Units, Focus Mount."
Chapter 7
Specific Operations
100 mm
Coarse control, 18.50 mm per rotation
Fine control, 3.27 mm per rotation
100 mm
65 mm
Coarse control, 18.50 mm per rotation
Fine control, 3.27 mm per rotation
75
Torque increases
Adjusting the torque of the focus knobs
Torque adjustment
ring