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INSTRUCTION MANUAL
Orion Apex
™
Maksutov-Cassegrain Optical
Tube Assemblies
#9820
#9823
#9825
Apex 90mm
Apex 102mm
Apex 127mm
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 161 Rev. C 02/09
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Summary of Contents for ORION TELESCOPES & BINOCULARS Apex 9820
- Page 1 INSTRUCTION MANUAL Orion Apex ™ Maksutov-Cassegrain Optical Tube Assemblies #9820 #9823 #9825 Apex 90mm Apex 102mm Apex 127mm 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 ©...
- Page 2 Finder scope Correct-image finder scope Eyepiece adapter bracket 25mm Sirius Plössl eyepiece Dovetail holder 45° correct-image diagonal Meniscus lens Focus knob Mounting block Figure 1: The Apex Maksutov-Cassegrain optical tube assembly parts diagram. The Apex 102mm is shown, but all models have similar components. Welcome to a new world of adventure! Your Apex These instructions will help you set up and properly Maksutov-Cassegrain (Mak-Cass) telescope is...
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Page 3: Getting Started
Getting Started Spring-loaded tensioner The Apex telescopes come nearly fully assembled from the factory. The optics have been installed and collimated, so you should not have to make any adjustments to them. Open the box and inspect the contents to make sure all of the parts list- ed above are present. -
Page 4: Aligning The Finder Scope
Camera tripods or altazimuth mounts are desireable for ter- under the stars. First, insert the 25mm eyepiece into the tele- restrial (land) viewing because they allow simple vertical and scope’s focuser. Then point the telescope at a discrete object horizontal movement of the telescope. An equatorial mount such as the top of a telephone pole or a street sign that is at is desirable for astronomical viewing because it allows easy least a quarter-mile away. - Page 5 To find celestial objects with your telescope, you first need Objective lens Alignment to become reasonably familiar with the night sky. Unless you thumb screws know how to recognize the constellation Orion, for instance, you won’t have much luck locating the Orion Nebula. A simple planisphere, or star wheel, can be a valuable tool for learn- ing the constellations and seeing which ones are visible in the sky on a given night.
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Page 6: Care And Maintenance
MARS If atmospheric conditions are good, you may be able can then rotate the camera (and eyepiece adapter) to the to see some subtle surface detail on the Red Planet, possibly desired orientation. Retighten the knurled ring when done. even the polar ice cap. Mars makes a close approach to Earth Care &... -
Page 7: Specifications
Specifications Near focus (with supplied eyepiece and diagonal): Approximately 11 feet Finder scope: 6x magnification, 26mm aperture, correct- #9820 Apex 90mm OTA image, achromatic, 6.3° field Optical design: Maksutov-Cassegrain Optical tube mounting block: Fits standard photo-style tripods Aperture: 90mm Case: Deluxe carry case for optical tube included Effective focal length: 1250mm Weight: 4.8 lbs Focal ratio: f/13.9... -
Page 8: One-Year Limited Warranty
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 war- ranty period Orion Telescopes &...
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