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Orion
Observer 90mm, 114mm, and 134mm
®
#52988
Congratulations on your purchase of an Orion telescope. Your new Observer Equatorial telescope is a ter-
rific instrument designed to provide outstanding views of celestial wonders. Any one of these three qual-
ity telescopes will reward you and your friends and family with many hours of enjoyment and discovery.
These instructions will help you set up, properly use, and care for your telescope. Please read them over
thoroughly before getting started.
A N E M P L O Y E E - O W N E D C O M P A N Y
Copyright © 2021 Orion Telescopes & Binoculars. All Rights Reserved. No part of this product instruction or any of its contents
may be reproduced, copied, modified or adapted, without the prior written consent of Orion Telescopes & Binoculars.
INSTRUCTION MANUAL
Equatorial Telescopes
#52986 Observer 114mm EQ Reflector
#52987 Observer 134mm EQ Reflector
#52988 Observer 90mm EQ Refractor
#52986
Corporate Offices: 89 Hangar Way, Watsonville CA 95076 - USA
Toll Free USA & Canada: (800) 447-1001
International: +1(831) 763-7000
Customer Support: support@telescope.com
#52987
IN 666 10/21
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Table of Contents
Related Manuals for Orion Observer 90mm
Summary of Contents for Orion Observer 90mm
- Page 1 A N E M P L O Y E E - O W N E D C O M P A N Y Copyright © 2021 Orion Telescopes & Binoculars. All Rights Reserved. No part of this product instruction or any of its contents may be reproduced, copied, modified or adapted, without the prior written consent of Orion Telescopes &...
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Page 2: Table Of Contents
Table of Contents II. Assembly Page 1. Spread the tripod (G) legs apart and stand it on the ground Parts (Figure 2). You can extend the legs to the desired height Assembly later using the leg lock knobs. For now just keep them fully retracted. - Page 3 Figure 1. A) Parts included with the Orion Observer EQ telescopes. B) Optical tube assemblies of the Observer EQ telescopes.
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Page 4: Preparing The Telescope For Operation
A 6x30 achromatic finder scope is included with the Observer ing the power switch to ON (refer to Figure 12 inset). The 134mm EQ reflector and Observer 90mm EQ Refractor. To align... - Page 5 Figure 3. Attach the accessory tray to the center of the tripod leg brace with the locking knob. Figure 4. Place the equatorial mount on the tripod. the 6x30 achromatic finder scope with the main telescope, aim the telescope in the general direction of an object at least 1/4- mile away, such as the top of a telephone pole.
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Page 6: Understanding And Using The Equatorial Mount
Thumbscrew Figure 8 Attach the two slow motion Groove cables to the gear shafts by orienting the cable so that the thumbscrew lines up with the groove of the gear shaft. Then tighten the thumbscrew. Dec. cable Figure 6. Slide the counterweight onto the counterweight shaft. R. - Page 7 rotate freely about the Dec. axis (Figure 18). If you loosen the saddle lock knob just a little, you can slide the dovetail Clamp knobs bar to move the telescope one way or the other. If that isn’t enough to balance the telescope, you can loosen the tube ring clamp knobs a few turns, until you can slide the telescope tube forward and back inside the rings.
- Page 8 Base Star diagonal Focus wheel Figure 14 Install the star diagonal in the drawtube collar of the Observer 90mm EQ, then place an eyepiece in the diagonal and secure Altitude it with the thumbscrew. adjustment knob Figure 12 Attach the red dot scope to the Observer 114mm EQ by pushing the bracket into the finder scope base.
- Page 9 Dec. lock knob Balance R.A. lock knob . To balance the telescope in declination, loosen the Figure 18 Dec. lock knob and slide the dovetail mounting bar forward to back in the mount saddle and/or slide the optical tube in the tube rings until balance is achieved.
- Page 10 Dec. are negative. slow-motion control cable is not needed for tracking. Objects will For example, the coordinates for the Orion Nebula (M42) are: appear to move faster at higher magnifications, because the field R.A.
- Page 11 Calibrating the Setting Circles 2. Loosen the Dec. lock knob and rotate the telescope until the Dec. value from the star atlas matches the reading on Using a star atlas or astronomy planetarium program, identify the Dec. setting circle. Remember that values of the Dec. a bright star visible in your sky.
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Page 12: Astronomical Observing
(mm) = Magnification Atmospheric conditions vary significantly from night to night. For example, the Observer 90mm EQ Refractor has a focal “Seeing” refers to the steadiness of the Earth’s atmosphere at length of 900mm, which when used with the supplied 25mm a given time. -
Page 13: Collimation Of Your Telescope's Optics
Orion, for instance, During partial phases, shadows are cast on the surface, which you won’t have much luck locating the Orion Nebula. A simple reveal more detail, especially right along the border between planisphere, or star wheel, can be a valuable tool for learning the dark and light portions of the disk (called the “terminator”). -
Page 14: Telescope Care And Maintenance
If you purchased the Observer 90mm EQ Refractor, your tele- Aligning the Primary Mirror scope’s lens optics were collimated at the factory and will not The final adjustment is made to the primary mirror. -
Page 15: Useful Optional Accessories
If you feel the mirrors need to be ascension axis of an equatorial telescope mount, enables cleaned, please contact Orion Customer Service at 800-676- your telescope to “track” the motion of stars and other 1343 for guidance. -
Page 16: Specifications
A N E M P L O Y E E - O W N E D C O M P A N Y Copyright © 2021 Orion Telescopes & Binoculars. All Rights Reserved. No part of this product instruction or any of its contents...