Related Manuals for Celestron G-3
Summary of Contents for Celestron G-3
- Page 1 G-3 and G-5 Telescope Models #11090 / #11091 / #11050/ #11051 CG-3 Equatorial Mount Model #91503-A INSTRUCTION MANUAL...
- Page 2 Focuser Ring Finderscope Finder Bracket Eyepiece Star Diagonal ¼"x20 Photo Adapter Mounting Mounting Block Platform Photo Adapter Tightening Knob Optical Tube Fig 1 – G-3 Optical tube Finderscope Corrector Plate Finder Bracket Eyepiece Mounting Block (G-5 Only) ¼" x 20 Photo Adapter Star Diagonal Mounting Platform (Used for the G-3)
-
Page 3: Telescope Assembly
This manual is designed to instruct you in the proper use of your Celestron G-3 and G-5 telescopes. To assist you in assembling and operating your telescope, take time to review this manual and the parts diagram listed in Figures 1 &... - Page 4 Place the accessory tray on the center support brace of the tripod and align the holes on the tray with those on the support brace. Insert the wingnut screws through the bottom of the tripod support brace and thread them into the accessory tray holes (See figure 3).
- Page 5 Place the end of one of the slow motion knobs over the shaft and tighten the thumb screw on the side. 4. Do the same for the declination slow motion shaft located just above the dec setting circle. Attaching the Optical Tube (G-3 optical tube) Before you attach the optical tube, make sure that the declination and right ascension locking knobs are tight.
- Page 6 Thread the second mounting screw into the hole nearest the declination slow motion cable. You may wish to remove the slow motion knob in order to access the hole more freely. It may be necessary to lift the optical tube slightly to allow the mounting screw to pass by the metal declination indicator attached to the mount.
- Page 7 Point the telescope at your target and center it in the main optics of the telescope. You may have to move the telescope slightly to center your target. Adjust the screws on the finderscope bracket, tightening one while loosening another, until the cross hairs are centered on the target seen through the telescope.
- Page 8 Tighten the thumbscrew on the visual back (rear cell) to hold the star diagonal in place. If you wish to change the orientation of the star diagonal, loosen the thumbscrew on the visual back until the diagonal rotates freely. Rotate the diagonal to the desired position and tighten the thumbscrew. The Eyepiece The eyepiece, or ocular, is the optical element that magnifies the image focused by the telescope.
-
Page 9: Telescope Basics
Telescope Basics Focusing Focusing the G-5 telescope: The G-5 telescope has a focusing knob located on the rear cell of the optical tube to the right of the star diagonal and eyepiece. Turn the focusing knob until the image is sharp. If the knob will not turn, the primary mirror has reached the end of its travel on the focusing mechanism. -
Page 10: Polar Alignment
The celestial equator is a full 360º circle bisecting the celestial sphere into the northern celestial hemisphere and the southern celestial hemisphere. Like the Earth's equator, it is the prime parallel of latitude and is designated 0º. The celestial parallels of latitude are called "coordinates of declination (Dec.)", and like the Earth's latitudes they are named for their angular distances from the equator. - Page 11 Many of the methods of polar alignment require that you know how to find the celestial pole by identifying stars in the area. For those in the northern hemisphere, finding the celestial pole is not difficult. Fortunately, we have a naked eye star less than a degree away. This star, Polaris, is the end star in the handle of the Little Dipper.
- Page 12 If you will be doing astrophotography, more precise polar alignment will be necessary. Details on more accurate polar alignments can be found in many astrophotography books or contact Celestron's technical support.
-
Page 13: Telescope Maintenance
Collimation or alignment of the optical system is done at the factory before shipment. Collimation (for the G-5 telescope only) The optical performance of your Celestron telescope is directly related to its collimation, the alignment of its optical system. Your Celestron G-5 was collimated at the factory after it was completely assembled. - Page 14 Collimation is the alignment of the optical elements. In the Schmidt-Cassegrain optical system used in the G-5, this is the alignment of the primary and secondary mirrors. To check the collimation of your telescope you will need a light source. A bright star near the zenith is ideal since there is a minimal amount of atmospheric distortion.
-
Page 15: Technical Specifications
OPTIONAL ACCESSORIES Celestron International offers a wide assortment of optional accessories to expand your interests. These accessory packages features popular items to accessorize the G-3 and G-5 telescopes. Accessory Package – G-3 (#92508) - Includes: 10mm SMA eyepiece – 1¼" (100x, Night Vision Flashlight, Moon Filter –... -
Page 16: List Of Bright Stars
Eyepiece filters - A line of filters are available for 1-1/4" eyepieces to enhance your visual observations of the Moon and planets. Numerous other accessories are available. See the Celestron Accessory Catalog (#93685) or ask your Celestron dealer for details. - Page 17 CELESTRON ONE YEAR WARRANTY Celestron International (CI) warrants this telescope to be free from defects in materials and workmanship for one year. CI will repair or replace such product or part thereof which, upon inspection by CI, is found to be defective in materials or workmanship.
- Page 18 Celestron International 2835 Columbia Street Torrance, CA 90503 Tel. (310) 328-9560 Fax. (310) 212-5835 Web site: http://www.celestron.com Copyright 1999 Celestron International All rights reserved. (Products or instructions may change without notice or obligation). Item #11050-ISNT Printed in China 01/99...
Need help?
Do you have a question about the G-3 and is the answer not in the manual?
Questions and answers