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ORION TELESCOPES & BINOCULARS BX90 Instruction Manual
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ORION TELESCOPES & BINOCULARS BX90 Instruction Manual

90mm equatorial refractor
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INSTRUCTION MANUAL
Orion
BX90 90mm
®
Equatorial Refractor
#52588
®
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 590 10/17

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Summary of Contents for ORION TELESCOPES & BINOCULARS BX90

  • Page 1 INSTRUCTION MANUAL Orion BX90 90mm ® Equatorial Refractor #52588 ® 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 &...

  • 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

    Tracking Celestial Objects 3. Point the telescope at the bright star whose coordinates you know. Lock the R.A. and Dec. lock knobs. Center the When you observe a celestial object through the telescope, you’ll star in the telescope’s field of view with the slow-motion see it drift slowly across the field of view.
  • 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 the more magnification is possible. In general, a figure of 50x per Use an optional Moon filter to dim the Moon when it is very bright. It simply threads onto the bottom of the eyepieces (you must first inch of aperture is the maximum attainable for most telescopes. Going beyond that will yield simply blurry, unsatisfactory views.

  • Page 13: Worthwhile Optional Accessories

    as you become more experienced and your observing skills Before cleaning, remove any loose particles or dust from the lens with a blower bulb or soft brush. Then apply some cleaning fluid get sharper, you will be able to ferret out more and more sub- tle details and structure.
  • 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 &...

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52588