Chapter 3 Operation
3.14 PFS (Perfect Focus System) Operation
86
3.14.3 Offset Adjustment
When the PFS function starts, the Z-axis position of the objective will track the vertical shift of the boundary
surface. To shift the focus onto the desired position, rotate the offset dial on the PFS offset controller.
The offset dial moves the mirror in the PFS Motorized Nosepiece, allowing you to adjust the focus within the
field of view, while maintaining the focused state.
The distance (i.e. the amount by which the focus was moved) from the reference position (boundary surface)
to the position moved to with the offset dial is referred to as “offset.” This offset will be maintained as the PFS
function tracks the vertical shift of the boundary surface.
* The maximum offset varies depending on the objective. In particular, water/oil immersion objectives are
limited in their downward offset.
PFS
DOWN
UP
PFS
OFFSET
CONTROLLER
FINE
COARSE
Figure 3-50 PFS Offset Controller
PFS Offset Controller operation
The PFS offset controller has an offset dial
component and a base plate that are magnetically
attached.
By changing the orientation of the dial component on
the base plate, the dial can be faced to the left or the
right. The dial can also be faced upward, if used
alone without the base plate.
DOWN
UP
PFS
OFFSET
CONTROLLER
FINE
COARSE
Figure 3-51 Offset adjustment
Offset adjustment
FINE/COARSE selector switch
The distance traveled by rotating the offset dial can
be switched between FINE and COARSE. The
selected state can be checked by whether the switch
is pressed in.
Offset dial:
Adjusts the offset. Rotate clockwise to increase the
offset (move the objective closer to the specimen), or
counterclockwise to decrease the offset (move the
objective further form the specimen).
• The offset dial is enabled only if the PFS
function is ON (PFS-ON switch is lit).
• When using the 4x or the 10x objective, the
offset can be adjusted with fine movements
only, regardless of the FINE/COARSE switch
setting.
Offset dial unit
Base plate
Offset dial
FINE/COARSE
selector switch
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