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Orion Observer 80ST Instruction Manual
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Orion Observer 80ST Instruction Manual

80mm equatorial refractor telescope
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INSTRUCTION MANUAL
Orion
Observer
80ST
™
®
Equatorial Refractor
#10273
®
Customer Support:
www.OrionTelescopes.com/contactus
Corporate Offices:
89 Hangar Way, Watsonville CA 95076 – USA
Providing Exceptional Consumer Optical Products Since 1975
Copyright © 2017 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.
IN 582 05/17

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Summary of Contents for Orion Observer 80ST

  • Page 1 Copyright © 2017 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. IN 582 05/17...

  • Page 2: Table Of Contents

    Congratulations on your purchase of an Orion telescope. Your new Observer 80ST Equatorial Refractor is a terrific starter instrument for exploring the exotic wonders of the night sky. Designed to be compact and easy to use, it will provide many hours of enjoyment for the whole family.
  • Page 3 Figure 1. The parts of the Observer 80ST EQ telescope .

  • Page 4: Assembly

    (Figure 8) until it contacts metal inside the housing. 7. Next, thread the counterweight shaft (M) into the base of Figure 2. The Observer 80ST EQ telescope fully assembled, with the Declination axis of the mount (Figure 9). key parts identified.

  • Page 5: Preparing The Telescope For Operation

    Accessory tray Screw head Washer Washer Wing nut Figure 4. Thread a leg lock thumbscrew onto each tripod leg as shown, being careful not to overtighten. Figure 5. Attach the accessory tray to each of the tripod three screw seats in the groove of the gear shaft, as shown in leg brace supports using the provided hardware.
  • Page 6 Note: The image in the telescope will appear mirror reversed, button cell battery to make contact with the finder scope’s elec- i.e., reversed left to right. This is normal for refractor tele- scopes used for astronomical observing with a standard star diagonal.

  • Page 7: Understanding And Using The Equartorial Mount

    (SCP). The star Sigma Octantis lies about 1° from the SCP, but it is barely visible with the naked eye (magnitude 5.5). To polar align the Observer 80ST’s equatorial mount: Slow-motion 1. Roughly level the equatorial mount by adjusting the length cable of the three tripod legs as needed.
  • Page 8 Eyepiece Focus drawtube Diagonal Focus wheels Figure 16. Secure the star diagonal in the focuser drawtube with the two thumbscrews, then secure the eyepiece in the diagonal. Figure 13. The fully assembled equatorial mount. Power switch Saddle Plastic Washer Opposite side Vertical knob Washer Horizontal knob...
  • Page 9 Dec. lock knob Dec. Setting circle R.A. lock knob Latitude R.A. adjustment R.A. Setting Setting Dec. Slow- bolt circle circle motion cable Latitude Latitude scale lock knob Dec. Slow- Azimuth motion R.A. Slow-motion cable lock knob cable Figure 18. Components of the equatorial mount, seen from both sides. Tracking Celestial Objects center the red dot on it.

  • Page 10: Astronomical Observing

    Figure 21. The Kellner eyepieces have barrels threaded to and automobile headlights. The glare from these lights will great- accept optional Orion 1.25" filters. A Moon filter is useful for cutting glare and revealing more detail on the lunar surface.
  • Page 11 Going beyond that will yield simply blurry, unsatisfactory views. parency”—air free of moisture, smoke, and dust. All tend to scat- Your Observer 80ST EQ has an aperture of 80mm, or 3.1 inch- ter light, which reduces an object’s brightness. Transparency is es, so the maximum magnification would be about 155x (3.1 x...

  • Page 12: Worthwhile Optional Accessories

    Unless you know A. The Moon how to recognize the constellation Orion, for instance, you won’t With its rocky surface, the Moon is one of the easiest and most have much luck locating the Orion Nebula. A simple planisphere, interesting objects to view with your telescope.

  • Page 13: Telescope Care And Maintenance

    Eyepieces: 25mm and 10mm Kellner, antireflection coated, 1.25" If you give your telescope reasonable care, it will last a lifetime. barrel diameter, threaded for Orion filters Store it in a clean, dry, dust-free place, safe from rapid changes Eyepiece magnification: 16x (with 25mm eyepiece) and 40x in temperature and humidity.
  • Page 14 One-Year Limited Warranty This Orion product is warranted against defects in materials or workmanship for a period of one year from the date of purchase. This warranty is for the benefit of the original retail purchaser only. During this warranty period Orion Telescopes &...

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