National-geographic NG90EQ User Manual

NG90EQ Maksutov-Cassegrain Telescope Instructions and Owner’s Manual

10The two eyepiece ports can be used in another way. With an optional camera adapter and appropriate T-ring a 35-mm SLR camera body can be attached t

11 The level of magnification required depends on the object being observed. Optimal performance is obtained if the magnification is typically not mo

12When possible, avoid sudden temperature changes, as the moisture in the air will condense on the objective lens. Should this occur after bringing y

13CARE AND CLEANING OF OPTICS Optical components of a telescope get dirty over time. Dirt or dust on a lens should be removed with the utmost care.

14The popular and more familiar constellations often provide the easiest landmarks to help find the planet’s locations and paths of orbit. Most peopl

152) Why can’t I see anything through my telescope? If you see only gray or black when looking through your telescope, even after searching for an o

2 A. Equatorial mount G. 3X Barlow lens M. Accessory tray screws a. Counterweight H. Main optical unit N. Tripod leg bolt

3Introduction Congratulations on your purchase of a precision-crafted NATIONAL GEOGRAPHIC™ telescope. With proper care and handling of your telesco

4ASSEMBLY 1) Carefully remove all parts from the cardboard cartons and lay them on a table or on the floor in order to take an inventory of all

5 (Fig. 2) (Fig. 3) 5) The main optical unit is a

6 7) The counterweight balances your telescope and makes it easy to adjust and position. Hold the counterweight in your hand so you can see through

710) Remove the plastic dust cap from the upper eyepiece port and insert the 25-mm eyepiece into the eyepiece holder. Tighten the small set screw to

8Complete the following settings in daylight: 1) Insert the 25-mm eyepiece into the eyepiece holder. Look at an easily recognizable, stationary obj

9You can also adjust the declination by raising or lowering the angle of the main optical unit until the arrow on the degree scale located on the sid