Chapter 3
Theory of Operation
P/N 79000035_SM, Version 1.5 3 - 7 Focus 30/35 Service Manual
Servo focus unit F30
This instrument is equipped with an motorized focusing device. Turning the focus control knob
controls the servo motor, which modifies the location of the moving lens and hence provides focusing
control, as illustrated below. The focus knob on the right hand site of the Alidade is connected to a
servo motor built into the telescope unit.
Location of servo focus
Fig. 3-5 Servo focus location
Technical specification
• Focusing range 1,5 m to infinite
• Movement of lens maximum speed of 10 mm/s
• Length focusing track 19,5 mm
Function description
The servo focus drive is placed in the telescope behind the eyepiece and is reached from the upper
side in second face.
Focusing motor
Control board
Shifting lens
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