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Orion
90mm ED Triplet Carbon Fiber
Apochromatic Refractor
Congratulations on your purchase of an Orion® EON ED90T CF 90mm ED Triplet Carbon
Fiber Apochromatic Refractor! This premium telescope excels for both visual observing and
astrophotography. It is designed with high quality precision ED optics and superior mechani-
cal construction. The optical tube is made from lightweight, thermally stable carbon fiber
material, which makes the telescope lighter and less prone to rapid expansion and contrac-
tion with changes in temperature. The sturdy 2.5" dual-speed (10:1) rack-and-pinion focuser
will rigidly support substantial imaging or visual equipment loads and provide smooth, back-
lash-free focusing. The extra-low dispersion, or "ED," optics offer outstanding color correc-
tion. These instructions will help you set up and use your telescope.
A N E M P L O Y E E - O W N E D C O M P A N Y
Copyright © 2022 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.
INSTRUCTION MANUAL
EON
®
#10386
ED90T
™
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
IN 671 01/22
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Summary of Contents for ORION TELESCOPES & BINOCULARS EON ED90T
- Page 1 Apochromatic Refractor #10386 Congratulations on your purchase of an Orion® EON ED90T CF 90mm ED Triplet Carbon Fiber Apochromatic Refractor! This premium telescope excels for both visual observing and astrophotography. It is designed with high quality precision ED optics and superior mechani- cal construction.
- Page 2 Fine focus knob dew shield focus knob Tube rings Figure 1. Features and components of the EON ED90T Carbon Fiber Apochromatic Refractor 1. Parts List WARNING: Do NOT look at the Sun without a professionally made solar filter on the telescope;...
- Page 3 Retractable Dew Shield imaging with a CCD or digital camera, the smaller focus knob The dew shield of the EON ED90T CF is retractable, allowing on the right side offers a 10:1 fine focus adjustment (10 turns of the telescope to become more compact for storage. With the the fine focus knob equals one turn of the coarse focus knob).
- Page 4 “from scratch” each time. Finder Scope Compatibility Focuser Rotation and Camera Angle Adjustment Adding an optional finder scope to the EON ED90T CF is easy. (CAA) The focuser is equipped with a dovetail finder scope shoe (see...
- Page 5 Observing with the EON ED90T CF adapter. For DSLRs and mirrorless cameras used with a stan- To observe with the EON ED90T CF you will need either a 1.25" dard 42mm or 48mm T-ring, the sensor distance will typically or 2" diagonal and an eyepiece, each sold separately. Because be 55mm.
- Page 6 In general, your telescope will only need to be cleaned on a very minimal basis. Dust particles on the objective lens do not affect the optical quality of your EON ED90T CF. Loose dust can simply be blown off with air, using a photographer’s blower bulb. Any remaining dust is best left alone, unless the build up is extreme.
- Page 7 6. Specifications Optical tube: Carbon fiber/epoxy resin with anodized aluminum components Optics design: Air-spaced triplet Lens cell: Machined aluminum Lens glass: One element of Hoya FCD100 ED glass; two elements standard optical glass Aperture: 90mm (3.5") Focal length: 540mm F-ratio: Lens coatings: Fully multi-coated (all air-to-glass surfaces multi-layer coated) Backfocus distance:...
- Page 8 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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