Nikon ECLIPSE TS100 Instructions Manual page 44

Eyes get tired during observations.
Causes
Interpupillary adjustment has not been
performed.
Diopter adjustment has not been
performed.
Brightness is inadequate.
Causes
Torque of coarse focus knob is too loose.
6 Troubleshooting
2 Operational
Loses focus over time.
E-43
Corrective Measures
Perform interpupillary adjustment.
(P.14)
Perform diopter adjustment. (P.15)
Turn the brightness adjuster to attain a
suitable brightness. (P.14)
Corrective Measures
Turn coarse torque adjustment ring to
tighten torque so the revolving
nosepiece does not fall on its own
weight. (P.25)