Celestron Astro Master 90eq Instruction Manual Page 1

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10 MMoovviinngg tthhee TTeelleessccooppee MMaannuuaallllyy In order to properly balance your telescope, you will need to move your telescop

11 Figure 2-23 AAddjjuussttiinngg tthhee EEqquuaattoorriiaall MMoouunntt In order for a motor drive to track ac

A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused. Some telesco

13 Image orientation as seen with the unaided eye & using erecting devices on refractors & Newtonians Inverted image, normal with Newtonians

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15 DDeetteerrmmiinniinngg FFiieelldd ooff VViieeww Determining the field of view is important if you want to get an idea of the angular size

Up to this point, this manual covered the assembly and basic operation of your telescope. However, to understand your telescope more thoroughly,

17 PPoollaarr AAlliiggnnmmeenntt wwiitthh LLaattiittuuddee SSccaallee The ea

18 PPooiinnttiinngg aatt PPoollaarriiss This method utilizes Polaris as a guidepost to the celestial pole. Sin

19 Figure 4-6 Aligning the equatorial mount to the polar axis of the Earth PPoollaarr AAlliiggn

2 Table of Contents INTRODUCTION ...

20 Pointing at Sigma Octantis This method utilizes Sigma Octantis as a guidepost to the celestial pole. Since Sig

21 DDeecclliinnaattiioonn DDrriifftt MMeetthhoodd ooff PPoollaarr AAlliiggnnmmeenntt This method of pola

22 AAlliiggnniinngg tthhee SSeettttiinngg CCiirrcclleess Before you can use the setting circles to find object

23 MMoottoorr DDrriivvee To allow tracking of celestial objects, Celestron offers a single axis DC motor drive

24 With your telescope set up, you are ready to use it for observing. This section covers visual observing hin

25 OObbsseerrvviinngg DDeeeepp--SSkkyy OObbjjeeccttss Deep-sky objects are simply those objects outside the bou

The AstroMaster series of telescopes was designed for visual observing. After looking at the night sky for a while you may want to try your hand a

27 While your telescope requires little maintenance, there are a few things to remember that will ensure your te

28 Aligning the Primary Mirror Now adjust the primary mirror screws to re-center the reflection of the small secon

29Figure 7-3 A collimated telescope should appear as a symmetrical ring pattern similar to the diffraction disk seen here. It is best to use the opt

3 Congratulations on your purchase of an AstroMaster Series telescope. The AstroMaster Series of telescopes come in several different models and

30 You will find that additional accessories for your AstroMaster telescope will enhance your viewing pleasure and expand the usefulness of your te

31 AAssttrrooMMaasstteerr SSppeecciiffiiccaattiioonnss 21064 & 21069 31045 & 31051 AM 90 EQ AM 130 EQ Opti

Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. (310) 328-9560 Fax. (310) 212-5835 Website www.cele

4 Figure 1-1 AstroMaster 90 EQ Refractor 1. Telescope Optical Tube 9. Latitude Adjustment Screw 2. Doveta

5 Figure 1-2 AstroMaster 130 EQ Newtonian 1. Eyepiece 8. Accessory Tray 2. Tube Ring 9. Tripod 3. T

This section covers the assembly instructions for your AstroMaster telescope. Your telescope should be set up indoor the first time so that it is

7 AAttttaacchhiinngg tthhee EEqquuaattoorriiaall MMoouunntt The equatorial mount allows you to tilt the telescopes axis of rotation so that yo

8 AAttttaacchhiinngg tthhee SSllooww MMoottiioonn CCaabblleess The AstroMaster mount comes with two slow motion control cables that allow you

9 Figure 2-17 Figure 2-18 Dec. Lock Knob on top of Dec. circle & R.A. Lock Knob on top of R.A. circle Mounting Knob & Safety