National GeographicメーカーNG90EQの使用説明書/サービス説明書
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NG90EQ Maksutov-Cassegrain Telescope Instructions and Owner’s Manual.
2 A. Equatorial mount G. 3X Barlow lens M. Accessory tray screws a. Counterweight H. Main optical unit N. Tripod leg bolts B. Counterweight shaft I. Accessory tray O. Tripod Legs C. Slow-motion control knobs J. Finder scope D. 9mm eyepiece K. 45º Diagonal prism E.
3 Introduction Congratulations on your purchase of a precision-crafted NATIONAL GEOGRAPHIC™ telescope. With proper care and handling of your telescope, you will enjoy the pleasure of looking at nature’s wondrous sights thr ough the eye of this instrument for many years.
4 ASSEMBLY 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 the pieces. Keep your box for storage or in case you ever need to ship your telescope. 2) Each aluminum tripod leg can extend to almost double its closed length.
5 (Fig. 2) (Fig. 3) 5) The main optical unit is attached to the equatorial mount with a black cast metal mounting plate. This mounting plate has f our chromed screws mounted in it. Remove all four screws. The mounting plate has one smooth face and one face with small ridges.
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 the hole in the weight.
7 10) Remove the plastic dust cap from t he upper eyepiece port and insert the 25-mm eyepiece into the eyepiece holder. Tighten the small set screw to hold the eyepiece securely in place.
8 Complete the following settings in daylight: 1) Insert the 25-mm eyepiece into the eyepiece holder. Look at an easily recognizable, stationary object that is at least 500 feet away. Slightly loosen all locking knobs and move the telescope until the object is in the center of the field of view.
9 You can also adjust the declination by raising or lowering the angle of the main optical unit until the arrow on the degree scale loca ted on the side of the equatorial mount points toward the north latitude of your observing location.
10 The 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 to the rear eyepiece port.
11 The level of magnification required depends on the object being observed. Optimal performance is obtained if the magnification is typically not more than appromiately 30X for every 10 mm of objective lens diameter .
12 When possible, avoid sudden temperature c hanges, as the moisture in the air will condense on the objective lens. Should this o ccur after bringing your telescope inside, leave the lens cap off the objective lens, tilt the objective (front) lens facedown, and wait until the telescope reaches room temperature.
13 CARE 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. A considerabl e amount of dirt or dust would have to accumulate on the optical surface before your view would be compromised.
14 The popular and more familiar constellations often provide the easiest landmarks to help find the planet’s locations and paths of orbit. Most people have looked up at the sky at night and seen some of the planets without even realizing it. A planet looks like a bright star but does not twin kle like a star does; it looks like a tiny ball.
15 2) Why can’t I see any thing through my telescope? If you see only gray or black when looking through your telescope, even after searching for an object to view, it is very likely that you are using an eyepiece that is too powerful.
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