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Orion 9527 Manual

8" f/4.0 newtonian astrograph
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i n s t r u c t i o n M a n u a l
Orion
8" f/4.0
®
Newtonian Astrograph
#9527
Providing Exceptional Consumer Optical Products Since 1975
OrionTelescopes.com
customer support (800) 676-1343 • E-mail: support@telescope.com
Corporate Offices (831) 763-7000 • 89 Hangar Way, Watsonville, CA 95076
IN 378 Rev. A 1/10

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  • Page 1 M a n u a l Orion 8" f/4.0 ® Newtonian Astrograph #9527 Providing Exceptional Consumer Optical Products Since 1975 OrionTelescopes.com customer support (800) 676-1343 • E-mail: support@telescope.com Corporate Offices (831) 763-7000 • 89 Hangar Way, Watsonville, CA 95076...

  • Page 2: Parts List

    We recommend keeping all of the original packaging. In the use your telescope. unlikely event you should need to ship the telescope back to Orion for warranty repair service, you should use the original packaging to ensure the telescope stays intact during ship- Parts List ping.
  • Page 3 Focus lock thumbscrew Accessory lock thumbscrew 1.25" Adapter Accessory lock 2" Collar thumbscrew Accessory Brass lock compression ring thumbscrew Coarse focus wheel 10:1 Fine focus wheel Drawtube tensioning thumbscrew Coarse focus wheel Figure 2. The dual-speed 2" Crayford-type linear bearing focuser are M6.

  • Page 4: Aligning The Finder Scope

    The bottom of the 1.25" eyepiece adapter is threaded to the wide groove on the finder scope’s body. accommodate 2" Orion filters. But with a filter installed, be Now slide the foot of the finder scope bracket into the dovetail careful when inserting an eyepiece or Barlow lens into the base on the main telescope.

  • Page 5: Cooling The Telescope

    Alternatively, the fan can be powered by a 12-volt DC field battery, such as the Orion Dynamo Pro. Your 8" f/4.0 Newtonian Astrograph is designed primarily for astro-imaging, but it makes a fine visual instrument as well.

  • Page 6: Collimating The Optics (Aligning The Mirrors)

    Attachment of a DSLR camera requires a T-ring for Astrograph, the camera must have a 1.25" or 2" nosepiece, which the particular camera model and a T-adapter, such as the Orion is inserted into the appropriate accessory holder in the focuser.
  • Page 7 We strongly recommend the use of a laser collimating tool The Primary Mirror Center Mark such as the Orion LaserMate Deluxe or LaserMate Pro to You’ll notice that the primary mirror of the 8" f/4.0 Newtonian aid in collimating the optics. A laser collimator will ensure a Astrograph has a tiny ring (sticker) marking its center.

  • Page 8: Aligning The Secondary Mirror

    Figure 12. To center the secondary mirror axially under the focuser, hold the secondary mirror holder in place with your fingers while adjusting the center screw with a large Phillips-head Figure 11. Placing a piece of white paper inside the optical tube screwdriver.

  • Page 9: Aligning The Primary Mirror

    rotate slightly when tightening the screw, so keep at it until the mirror faces the focuser squarely and is secured in place. Adjusting the Secondary Mirror’s Tilt Finally, the tilt of the secondary mirror may occasionally require adjustment. If the entire primary mirror reflection is not visible in the secondary mirror when using the collima- tion cap, as in Figure 9c, you will need to adjust the tilt of the secondary mirror.

  • Page 10: Care And Maintenance

    Out of collimation Collimated Figure 14. A star test will determine if the telescope’s optics are properly collimated. A defocused view of a bright star through the eyepiece should appear as illustrated on the right if the optics are perfectly collimated. If the circle is unsymmetrical, as illustrated on the left, the optics need alignment.

  • Page 11: Specifications

    Specifications the Phillips-head screw is unthreaded, the secondary mirror and its holder can be removed from the telescope. The sec- Orion 8" f/4.0 Newtonian Astrograph ondary mirror does not need to be removed from its holder for ® cleaning. Then follow the same procedure described below Optical configuration: Newtonian reflector for cleaning the primary mirror.

  • Page 12: One-Year Limited Warranty

    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 returned postage paid to: Orion Warranty Repair, 89 Hangar Way, Watsonville, CA 95076. Proof of purchase (such as a copy of the original receipt) is required.

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