Troubleshooting Guide - National Geographic 80-30124 Manual De Instrucciones

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. Ask your parents to help if
your telescope is really dirty. 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
Despite using star diagonal prism the picture
is "crooked"
Telescope Terms to Know:
Objective Lens
Aperture
(mm)
Aperture:
This figure, which is usually expressed in millimeters, is the diameter of a telescope's light-gathering surface (objective
lens in a refractor or primary mirror in a reflector). Aperture is the key factor in determining the brightness and
sharpness of the image.
Objective Lens:
The objective lens is the main light-gathering component of a refractor telescope. It is actually composed of several
lens elements.
Diagonal:
This accessory houses a mirror that deflects the ray of light 90 degrees. With a horizontal telescope tube, this device
deflects the light upwards so that you can comfortably observe by looking downwards into the eyepiece. The image
in a standard diagonal mirror appears upright, but rotated around its vertical axis (mirror image). To get an image
without this rotation, you will need to use a special diagonal with an erect image prism.
Solution
Remove dust protection cap.
Adjust focus using focus ring.
Wait for temperature to balance out.
Never observe through a glass surface such as a window.
The star diagonal prism should be vertical in the eyepiece
connection.
Focal Length Telescope
(mm)
6
Eyepiece
Focuser
Diagonal Focal Point
Focal Length
Eyepiece
(mm)
ENG