Download
Share
Print this page
  1. Manuals
  2. Brands
  3. Orion Manuals
  4. Telescope
  5. BX90
  6. Instruction manual

Orion BX90 Instruction Manual

90mm equatorial refractor
Hide thumbs

Advertisement

Quick Links

Download this manual
INSTRUCTION MANUAL
Orion
BX90 90mm
®
Equatorial Refractor
#52588
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
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.
IN 590 10/17

Advertisement

loading
Need help?

Need help?

Do you have a question about the BX90 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Orion BX90

Summary of Contents for Orion BX90

  • 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 &...

  • Page 2: Table Of Contents

    Congratulations on your purchase of an Orion telescope. Your new BX90 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 BX90 EQ refractor...

  • Page 4: Assembly

    Before you can use the red dot finder scope, you must remove Figure 2. The fully assembled BX90 EQ refractor. the tab sticking out from the battery compartment (Figure 13).
  • 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. Doing so will allow the pre-installed 3V CR-2032 button cell bat- tery to make contact with the finder scope’s electronic circuitry to power the finder’s red LED illuminator.
  • Page 6 Typically the dim 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 BX90’s equatorial mount.
  • Page 7 Tube Knurled mounting knob clamp Pins Slots Washer Slow-motion cable Gear shaft Saddle Wing Figure 9. Install the tube mounting clamp onto the mount saddle. B) Secure the clamp to the saddle with the two wing nuts. Balancing the Telescope In order for the telescope to move smoothly on its mechanical axes, it must first be balanced as follows: 1.

  • Page 8: Understanding And Using The Equatorial Mount

    Sigma Octantis lies about 1° from the SCP, but it is barely Star visible with the naked eye (magnitude 5.5). diagonal To polar align the BX90’s equatorial mount: Focus wheel Thumbscrew 1. Roughly level the equatorial mount by adjusting the length of the three tripod legs as needed.
  • Page 9 NOTE: You can do the polar alignment with the telescope attached to the equatorial mount. R.A. lock The equatorial mount is now polar aligned. From this point knob on in your observing session, you should not make any further adjustments to the azimuth or the latitude of the mount, nor should you move the tripod.

  • Page 10: Astronomical Observing

    (don’t touch the azimuth lock circle are negative. knob). That will throw off the mount’s polar alignment. Once the So, the coordinates for the Orion Nebula are: mount is polar aligned, the telescope should be moved only R.A. 5h 35.4m Dec. -5° 27’...
  • Page 11 Eyepiece Focal Length (mm) position in order to account for the sky’s apparent motion. For example, the BX90 EQ has a focal length of 600mm, which given time. In conditions of poor seeing, atmospheric turbulence when used with the supplied 25mm eyepiece yields: causes objects viewed through the telescope to “boil.”...
  • Page 12 Orion, for instance, a distance of 238,000 miles away! With its ever-changing phas- you won’t have much luck locating the Orion Nebula. A simple es, you’ll get a new view of the Moon every night. The best time...

  • Page 13: Worthwhile Optional Accessories

    Eyepieces: 25mm Kellner and 10mm Plossl, 1.25" barrel • Planisphere – A nifty “star wheel” that shows what stars diameter, threaded for Orion filters and constellations are visible in the sky at any time of any Eyepiece coatings: Fully antireflection coated night.
  • Page 14 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...

This manual is also suitable for:

52588