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Orion CT80 Instruction Manual
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Orion CT80 Instruction Manual

Compact 80mm equatorial refractor
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INSTRUCTION MANUAL
Orion
CT80 Compact 80mm
®
Equatorial Refractor
#9911
®
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 598 10/17

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Summary of Contents for Orion CT80

  • 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 598 10/17...

  • Page 2: Table Of Contents

    Congratulations on your purchase of an Orion telescope. Your new CT80 Equatorial Refractor is a terrific starter instrument for exploring the exotic wonders of the night sky. Designed to provide a wide field of view and excellent portability, it will provide many hours of enjoyment for the whole family.
  • Page 3 Figure 1. Parts of the CT80 EQ refractor...

  • Page 4: Assembly

    LED-illuminated red dot on the sky, showing exactly where the telescope is pointed. It permits easy object targeting prior to observation in the higher- Figure 2. The fully assembled CT80 EQ refractor. power main telescope.
  • Page 5 Hooked tab Accessory tray Screw Leg collar Lock knob Figure 3. A) , B) Hook the tray corner over the screw in the leg collar Repeat for the other two legs, then Tighten all three tray lock knobs. Before you can use the red dot finder scope, you must remove the tab sticking out from the battery compartment (Figure 13).
  • Page 6 Saddle Declination setting Gear shaft Declination circle Right ascension Pointer setting circle Slow-motion cable, Declination Slow-motion Pointer cable, R.A. Gear shaft, R.A. Latitude scale Latitude adjustment bolt Latitude lock bolt Figure 7. The CT80’s equatorial mount.
  • Page 7 Knurled knob Tube mounting Pins clamp Slots Slow-motion cable Gear shaft Saddle Mounting clamp Washer Wing Figure 9. Install the tube mounting clamp onto the mount saddle. B) Secure the clamp to the saddle with the two wing nuts. At the end of your observing session, be sure to slide the power switch on the red dot finder scope to OFF to preserve battery life.

  • Page 8: Understanding And Using The Equartorial Mount

    Power switch Finder scope base Battery compartment Opposite side Vertical adjustment Horizontal knob adjustment knob Figure 11. Slide the red dot finder scope’s bracket into its base. Figure 13. The red dot finder scope has vertical and (inset) Balancing the Telescope horizontal adjustment knobs for aligning it with the telescope.
  • Page 9 (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 CT80’s equatorial mount: Little Dipper (in Ursa Minor) 1.
  • Page 10 So, the coordinates for the Orion Nebula are: about the R.A. and Dec. axes by loosening one or both of the R.A. 5h 35.4m Dec. -5° 27’...

  • Page 11: Astronomical Observing

    16). If the image is unsymmetrical, the optics are out of align- viewing conditions. Your CT80 EQ refractor comes with 25mm ment. The dark shadow cast by the secondary mirror should and 10mm eyepieces, which will suffice nicely to begin with.
  • Page 12 Going beyond that will yield simply blurry, unsatisfactory views. Use an optional Moon filter to dim the Moon when it is very bright. Your CT80 EQ has an aperture of 80mm, or 3.1 inches, so the It simply threads onto the bottom of the eyepieces (you must first maximum magnification would be about 155x (3.1 x 50).

  • Page 13: Worthwhile Optional Accessories

    Orion, for instance, Your refractor telescope requires very little mechanical mainte- you won’t have much luck locating the Orion Nebula. A simple nance. The optical tube has a smooth painted finish that is fairly planisphere, or star wheel, can be a valuable tool for learning scratch-resistant.
  • Page 16 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 &...