Orion EON 110mm ED f/6.0 Instruction Manual
INSTRUCTION MANUAL
Orion® EON™ 110mm ED f/6.0
Apochromatic Refractor
#10031
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without the prior written consent of Orion Telescopes & Binoculars.
89 Hangar Way, Watsonville CA 95076 - USA
IN 496 Rev.D 11/18
Congratulations on your purchase of an Orion EON 110mm ED f/6.0 Apochromatic Refractor! Your telescope has been designed
with high quality precision ED optics and superior mechanical construction. The 2.7” hybrid-design, dual-speed (11:1) Crayford
focuser with linear bearings will rigidly support heavy imaging or visual equipment loads and provide smooth, backlash-free focusing. The extra-low dispersion, or “ED,” optics offer outstanding color correction. These instructions will help you set up and use your
telescope.
Tube rings
Finder scope base
1.25" twisttight collar
Retractable dew shield
Coarse focus knobs (x2)
2" twist-tight
collar
Figure 1. Features and components of the EON 110 ED F/6.0
Apochromatic Refractor
Fine focus knob
WARNING: NEVER look directly at the Sun
through your telescope—even for an instant—
without a professionally made solar filter that
completely covers the front of the instrument,
or permanent eye damage could result. Young
children should use this telescope only with
adult supervision.
Table of Contents
Parts List ................................................................................... 2
Getting Started ......................................................................... 2
Features and Functions ........................................................... 3
Operating the EON 110mm ED ............................................... 4
Care & Maintenance ................................................................ 5
Specifications ........................................................................... 7
2.7" hybrid-design focuser
Parts List
• EON 110mm ED f/6.0 optical tube assembly
• Aluminum objective cap
• 1.25" twist-tight adapter
• Tube rings (pair)
• Hard carrying case
• 2.5mm hex key
Getting Started
The EON 110mm ED apochromatic refractor comes fully
assembled from the factory. The telescope’s optics have been
assembled and precisely collimated at the factory, so they
should not require any adjustments. Please keep the original
shipping box. In the unlikely event that you need to ship the
telescope back to Orion for warranty repair service, you should
use the original packaging.
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Features and Functions
The EON 110 ED apochromatic refractor has premium features
designed to maximize the performance of the scope and its
convenience of use. Please refer to Figure 1 to become famil-
iar with the telescope’s features.
“Extra-Low Dispersion” (ED) Doublet Optics
The EON 110 ED utilizes high-end doublet optics designed to
minimize chromatic aberration. The objective lens assembly
comprises two individual lenses, the crown (front) element,
and flint (rear) element. The flint glass element is made from
FPL-51 ED glass, made by Ohara of Japan. The “ED” stands
for “Extra-Low Dispersion”. The use of this ED glass minimizes
chromatic dispersion, or the amount of chromatic aberration,
resulting in a much sharper image free of color fringing. Critical
stellar or planetary observations become more accurate with
this color correction since the focused images are free of “false”
color halos around the object.
Retractable Dew Shield
The dew shield of the EON 110 ED is retractable, allowing the
telescope to become more compact for storage. With the dew
shield extended, the scope is 26.75" long; with the dew shield
retracted, the length reduces to 21.75". The dew shield’s primary purpose is to inhibit dew (water condensation) from forming on the lens during cold and humid nights. The dew shield is
also useful for reducing glare from unwanted outside lights. To
extend the dew shield, simply pull it forward until it stops.
linear-bearing system enables the focuser to support up to a
hefty 8kg (17.6 lbs.) of payload -- such as a large format CCD
camera, filter wheel, and other accessories. The patented focus
lock mechanism locks the drawtube in two directions, providing
a much more rigid lock than the single-point locking mechanism
found on most focusers. The lock knob is located on the underside of the focuser (Figure 3).
The dual-speed (11:1) focusing mechanism will keep your target object crisp and sharp. For quick focusing, the two large
focus knobs provide a coarse focus. For more precise focusing, as needed for applications such as high-power planetary
observing and imaging with a CCD or digital camera, the smaller focus knob on the right side (Figure 2) offers an 11:1 fine
focus adjustment (11 turns of the fine focus knob equals one
Focus lock knob
Drawtube tension
setscrew
Du al-Speed 2 .7 " Hybrid-Design Linear Bearing
Focuser
Focusing the EON 110 ED is truly a joy, thanks to the allmachined, 2.7" hybrid-drive linear bearing focuser (Figure
2). And for imaging, where a focuser’s rigidity to support one’s
imaging equipment without flexure or slippage is critical, this
focuser makes the grade. The hybrid design rack-and-pinion
linear bearing focuser provides exceptionally smooth, backlash-free focus motion. The helical gear drive and 8 ball bearing
2" twist-tight
accessory collar
Slotted screw (x3)
1.25" twist-tight accessory
collar (1.25" adapter)
Rotation ring for 2"
accessory collar
Rotation thumbscrew locks
Slotted screw (x3)
Coarse focus knob
Fine focus knob
Tapered
collar
Figure 2. The 2.7” dual-speed, hybrid-drive focuser has two
rotatable components.
Figure 3. The underside of the focuser features a focus lock knob
and drawtube tension setscrew.
turn of the coarse focus knob).
If you find that the focus adjustment is too hard to turn or if
the drawtube slips under the weight of your eyepiece or camera, you can make adjustments to the focuser tension by using
the focuser tension setscrew located on the bottom side of the
focuser (Figure 3). Make adjustments to this setscrew until
the focuser motion feels smooth and holds in place when you
have obtained focus. It may be necessary to make adjustments
when the weight of your accessories changes significantly.
Twist-Tight Accessory Collars
The latest release of the EON 110mm ED features a 2" twisttight collar and a 1.25" twist-tight adapter (Figure 4). The
twist-tight mechanism replaces and is superior to conventional
collars that utilize a thumbscrew to secure accessories to the
focuser. Thumbscrews can sometimes fall out and get lost,
and are harder to grip in the cold when wearing gloves. The
twist-tight mechanism provides an extremely secure attachment with just a twist of the large knurled collar. Both collars
have a non-marring internal compression ring for securing a
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