Troubleshooting Guide - National Geographic SRT70MM Instruction Manual

Cleaning:
Your telescope is a precision optical device and keeping the optics free of dust and dirt is crucial for
optimal performance. To clean the lenses (objective and eyepiece) use only a photo-grade soft brush or
a lint-free cloth, like a microfiber cloth. Do not press down too hard while cleaning, as this might scratch
the lens. If necessary, the cleaning cloth can be moistened with an optical glass cleaning fluid and the lens
wiped clean using very little pressure. The eyepiece is NOT waterproof so do not spray fluids directly
onto the glass or dip it in water. Never use harsh detergents! After you have finished cleaning an
eyepiece, allow it to fully dry before storing.
Make sure your telescope is always protected against dust and dirt. After use, leave it in a warm room to
dry off before storing.

Troubleshooting Guide:

Problem
No picture
Blurred picture
No focus possible
Bad quality
Solution
Remove dust protection cap.
Adjust focus using focus wheel.
Wait for temperature to balance out.
Never observe through a glass surface such as a
window.
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