Orion Observer 90mm User Manual

INSTRUCTION MANUAL
IN 666 10/21
Orion
®
Observer 90mm, 114mm, and 134mm
Equatorial Telescopes
#52986 Observer 114mm EQ Reflector
#52987 Observer 134mm EQ Reflector
#52988 Observer 90mm EQ Refractor
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Copyright © 2021 Orion Telescopes & Binoculars. All Rights Reserved. No part of this product instruction or any of its contents
may be reproduced, copied, modied or adapted, without the prior written consent of Orion Telescopes & Binoculars.
AN EMPLOYEE-OWNED COMPANY
#52988 #52986 #52987
Congratulations on your purchase of an Orion telescope. Your new Observer Equatorial telescope is a ter-
ric 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.

Orion Observer 90mm Specifications

General

Brand	Orion
Model	Observer 90mm
Category	Telescope
Language	English

Summary

I. Parts

II. Assembly

III. Preparing the Telescope For Operation

Aligning and Using the Finder Scope

The Red Dot Finder Scope

IV. Understanding and Using the Equatorial Mount

Balancing the Telescope

Detailed steps to balance the telescope on both R.A. and Dec. axes for smooth movement.

Polar Alignment

Instructions on how to align the telescope mount with Earth's rotational axis for tracking.

Using the R.A. and Dec. Slow-Motion Control Cables

Explains how to use slow-motion cables for fine adjustments and tracking.

Tracking Celestial Objects

How to keep celestial objects centered in the field of view using the polar-aligned mount.

V. Astronomical Observing

Eyepiece Selection

Focusing the Telescope

Instructions on how to achieve sharp focus for observed objects.

Objects to Observe

VI. Collimation of Your Telescope's Optics

Aligning the Secondary Mirror

Procedure for adjusting the secondary mirror for proper alignment.

Aligning the Primary Mirror

Procedure for adjusting the primary mirror for final optical alignment.

Star-Testing the Telescope