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INSTRUCTION MANUAL
Orion
®
Skywatcher
90mm EQ
#9024
Equatorial Refracting Telescope
Customer Support (800) 676-1343
E-mail: support@telescope.com
Corporate Offices (831) 763-7000
P.O. Box 1815, Santa Cruz, CA 95061
Providing Exceptional Consumer Optical Products Since 1975
IN 112 Rev. A 0399

Summary of Contents

  • Page 1

    INSTRUCTION MANUAL Orion ® Skywatcher 90mm EQ ™ #9024 Equatorial Refracting Telescope Customer Support (800) 676-1343 E-mail: support@telescope.com Corporate Offices (831) 763-7000 P.O. Box 1815, Santa Cruz, CA 95061 Providing Exceptional Consumer Optical Products Since 1975 IN 112 Rev. A 0399...

  • Page 2

    Piggy back camera adapter Tube mounting rings Finder scope bracket Finder scope Tube ring mounting plate Alignment screws (3) Dec. lock knob Dec. setting circle Eyepiece R.A. lock knob Star diagonal R.A. slow-motion control Focus knob Counterweight locking thumbscrew Dec. slow-motion control Counterweight R.A.

  • Page 3: Table Of Contents

    Learn to recognize the patterns of stars in the major constellations; a star wheel, or planisphere, available from Orion or from your local telescope shop, will greatly help. With a little practice, a little patience, and a reasonably dark sky away from city lights, you’ll find your telescope to be a never-ending source of wonder, exploration, and relaxation.

  • Page 4: Assembly .............................................................................................................................. 3, Assembly

    Open the tube rings by first loosening the knurled ring clamps. 10.Lay the telescope optical tube in the tube rings at about the midpoint of the tube’s length. Rotate the tube in the rings so the focus knobs are on the underside of the telescope.

  • Page 5: Tripod Legs

    3. Retighten the counterweight locking thumbscrew. The tel- escope is now balanced on the R.A. axis. 4. To balance the telescope on the Dec. axis, first tighten the R.A. lock knob, with the counterweight shaft still in the hor- izontal position.

  • Page 6

    The R.A. and Dec. values for celestial objects can be found in any star atlas or star catalog. So, the coordinates for the Orion Nebula listed in a star atlas will look like this: R.A. 5h 35.4m Dec. -5° 27' That’s 5 hours and 35.4 minutes in right ascension, and -5...

  • Page 7

    Figure 1 the telescope is pointed north as it would be during polar alignment. The counterweight shaft is oriented down- ward. But it will not look like that when the telescope is pointed in other directions. Let’s say you want to view an object that is directly overhead, at the zenith.

  • Page 8

    (called the “terminator”). A full Moon is too bright and devoid of surface shadows to yield a pleas- ing view. Try using a Moon Filter (Orion part #5662) to dim the Moon when it is very bright. It simply threads onto the bottom of the eyepieces (you must first remove the eyepiece from the star diagonal to attach the Moon filter).

  • Page 9: Astrophotography ................................................................................................................. 9

    Consult a star atlas or observing guide for information on find- ing and identifying deep-sky objects. A good source to start with is the Orion DeepMap 600 (part #4150). 7. Astrophotography There are several different types of astrophotography that can...

  • Page 10: Slow-motion Control Cables

    The Skywatcher 90 may also be used for long-distance view- ing over land. For this application we recommend substitution of an Orion 45° Correct-Image Diagonal (#8790) for the 90° star diagonal that comes standard with the telescope. The cor- rect-image diagonal will yield an upright, non-reversed image and also provides a more comfortable viewing angle, since the telescope will be aimed more horizontally for terrestrial subjects.

  • Page 11

    The tissue may leave fibers on the lens, but this is not a problem; they can be blown off with a blower bulb. Never disassemble the telescope or eyepieces to clean opti- cal surfaces! 10. Specifications Optical tube: Seamless aluminum Objective lens diameter: 90mm (3.5")

  • Page 12

    Figure 2b. Telescope is now balanced on the R.A. axis. That Figure 2a. Balancing the telescope with respect to the R.A. is, when hands are released, counterweight shaft remains axis by sliding the counterweight along its shaft. horizontal. Figure 2c. Preparing the telescope to be balanced on the Figure 2d.

  • Page 13

    R.A. lock knob Declination (Dec.) slow motion control Latitude adjustment t-bolt Azimuth adjustment knob Big Dipper (in Ursa Major) To find Polaris in the night sky, look north and find the Big Dipper. Extend an imaginary line from the two “Pointer Stars” in the bowl of the Big Dipper.

  • Page 14

    Figure 5a. Telescope pointing south. Note that in all these Figure 5b. Telescope pointing north. illustrations, the mount and tripod remain stationary; only the R.A. and Dec. axes are moved. Figure 5d. Telescope pointing west. Figure 5c. Telescope pointing east.

  • Page 15

    One-Year Limited Warranty This Orion Skywatcher 90 EQ 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 & Binoculars will repair or replace, at Orion’s option, any warranted instrument that proves to be defective, provided it is...

  • Page 16

    Refer to Figure 1 to identify the parts of the finder scope bracket. Spring-loaded tensioner Figure 1 Customer Support (800) 676-1343 E-mail: support@telescope.com Corporate Offices (831) 763-7000 P.O. Box 1815, Santa Cruz, CA 95061 O-ring (not pictured) Alignment screws...

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