Orion 13036 User manual

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INSTRUCTION MANUAL
Congratulations on your purchase of a quality Orion 2" Low-
Prole Dual-Speed Hybrid Reector Focuser. This focuser is
intended for use with 6" to 12" aperture Newtonian reectors.
If you do not have a Newtonian reector, the focuser may not
be appropriate for your telescope.
Crayford focusers generally perform better than rack-and-pin-
ion models because the design eliminates “focus shift”. Focus
shift is when an image moves position in the eyepiece when
it is being focused. This is very hard to eliminate in rack-and-
pinon focusers due to slight gear and tolerance imperfections
which cause the drawtube to move slightly left or right when
focusing. For the Crayford design, the drawtube is constantly
tensioned (by the focusing shaft and four “roller bearings”)
so the drawtube cannot move perpendicular to the desired
motion.
The 2" Low-Prole Dual-Speed Hybrid Reector Focuser pro-
vides the most focus range for accessories that require extra
in-travel. With a minimum focus height of 43mm, this focuser
is an excellent choice for any astrophotographic system. The
strong machined aluminum construction supports heavy
2" eyepieces as well as heavy camera bodies. The smooth
focus motion and ne-focus wheel allow precision adjust-
ments for critical focusing of eyepieces and cameras.
Installation
This focuser was designed to be a “drop-in” replacement
for the 2" focuser that comes standard on Orion 8" and 10"
reectors, including IntelliScope and Classic Dobsonians. If
you have one of these telescopes, installing the 2" Crayford
will be easy. You will need a Phillips head screwdriver and an
adjustable crescent wrench or pliers. Use the following pro-
cedure:
1. Position your Newtonian reector optical tube so it is hori-
zontal. This will prevent any screws or nuts from falling
onto the primary mirror.
2. From the inside of the tube, secure one of the four focuser
securing nuts with the wrench or pliers.
3. Use the screwdriver to completely unthread the focuser
attachment screw from the securing nut currently being
held by the wrench or pliers.
4. Repeat this for the other three nut and screw pairs.
5. Remove the 2" focuser from the tube.
6. Place the 2" Low-Prole Dual-Speed Hybrid Reector
Focuser where the other focuser was previously. Orient
the focuser the same as the removed one was. The
through holes in the base of the focuser should line up
with the holes in the telescope tube.
Figure 1. The Orion 2" Low-Prole Dual-Speed Hybrid Reector Focuser.
IN 474 Rev A 08/12
Orion 2" Low-Profile Dual-Speed Hybrid Reflector Focuser
#13036
Eyepiece thumbscrew
1.25" eyepiece adapter
Focus wheel
Fine focus wheel
Focus wheel
Drawtube tension adjustment screw
Focus lock thumbscrew
Drawtube extension thumbscrew

7. Install the four screw and nut pairs using the wrench or pli-
ers and the included hex key. Tighten the screws rmly.
Note: SkyQuest XT8 Classic Dobsonian telescopes purchased prior to
2007 will require modification to accept this focuser.
If you do not have an 8" or 10" Orion Newtonian reector, you
will need to modify your tube so the focuser will t. This will
require drilling four holes into the tube for the mounting screws.
Use a 3/16" drill bit to do this. Use the base of the focuser as
a template when drilling these holes.You may also need to cut
a larger hole (approximately 2.5" diameter) in the telescope for
the bottom of the focuser. Be careful not to cut your ngers on
any sharp tube edges when attempting to do this. Keep in mind
that the minimum focus height for the 2" Crayford focuser is
approximately 43mm, so if your eyepieces reach focus closer
to the tube than this, additional modications to the telescope
may be required.
The focuser can be rotated, should the need arise. This
requires a 1.5mm hex key (not included). To reposition the fo-
cuser, loosen the four small socket-head set-screws that are
located within the base. Rotate the focuser to the preferred
position and carefully tighten the four set screws with the
1.5mm hex key. Be sure to keep the focuser at against the
base to ensure proper alignment.
Usage
Using the 2" Low-Prole Dual-Speed Hybrid Reector Focuser
is very straightforward. Place your 2" eyepiece in the focuser
drawtube, and secure it in place with the thumbscrew. Imaging
cameras should generally utilize a 2" camera adapter when
used with the focuser. Insert the camera adapter the same
way as a 2" eyepiece. To focus, simply rotate one of the focus
wheels.
The large focus lock thumbscrew near the focusing shaft (see
Figure 1) locks the drawtube into position once focus has
been achieved. This is especially useful when using a camera
or heavy eyepiece in the focuser. Be sure this thumbscrew is
loosened when focusing.
The socket head set screw above the focus lock thumbscrew
(see Figure 1) adjusts drawtube focusing tension. If a heavy
eyepiece causes the drawtube to move inward by itself (draw-
tube tension too loose), or the focus wheels are difficult to turn
(drawtube tension too tight), then you will want to adjust this
set screw. This requires the 2.5mm hex key.
In addition to the nominal focus travel of 24mm, the extendable
drawtube adds up to 44mm of focus travel yielding a total focus
range of 68mm. To extend the drawtube, loosen the drawtube
extension thumbscrew and gently pull the drawtube upwards to
the preferred position. Tighten the drawtube extension thumb-
screw to lock the drawtube in place. The extendable drawtube
is a welcome feature when switching between an eyepiece
and camera, as no external extension tubes are required.
The 2" Low-Prole Dual-Speed Hybrid Reector Focuser pro-
vides the most focus range for accessories that require extra
in-travel. With a minimum focus height of 49mm, this focuser
is an excellent choice for any astrophotographic system. The
strong machined aluminum construction supports heavy 2"
eyepieces as well as heavy camera bodies. The smooth focus
motion and ne-focus knob allow precision adjustments for
critical focusing of eyepieces and cameras.
In addition to the nominal focus travel of 24mm, the extendable
drawtube adds up to 44mm of focus travel yielding a total focus
range of 68mm. To extend the drawtube, loosen the drawtube
extension thumbscrew and gently pull the drawtube upwards to
the preferred position. Tighten the drawtube extension thumb-
screw to lock the drawtube in place. The extendable drawtube
is a welcome feature when switching between an eyepiece
and camera, as no external extension tubes are required.
Fine Focus
The focuser features dual speed adjustment with the ne focus
wheel. This small black wheel located on the side of the right-
hand focus wheel allows precise focus adjustment at a ratio of
11:1, meaning one turn of the focus wheel equals eleven turns
of the ne focus wheel.
Use the focus wheels to achieve rough focus on your target
object, then use the ne focus wheel to coax out even more
detail. You’ll be amazed at the amount of detail ne focus
adjustments allow you to view on targets such as the lunar sur-
face, planets, double stars, as well as other celestial objects.
The 1.25" Eyepiece Adapter
In order to use a 1.25" eyepiece in the focuser, you must rst
install the 1.25" eyepiece adapter. Place this adapter into the
drawtube like a 2" eyepiece, and loosely secure it with the
thumbscrew. Insert a 1.25" eyepiece into the adapter, and
secure the eyepiece by further tightening the thumbscrew.
Tightening the thumbscrew compresses a ring around the
1.25" eyepiece adapter, which in turn secures and precisely
centers the 1.25" eyepiece.
Specifications
Focuser design: Crayford, accepts 2" eyepieces
and 1.25" eyepieces with included
adapter.
Minimum focus height: 43mm
Focus travel: 24mm, 68mm with 2" drawtube
extended
Other features: Focus lock, drawtube focusing
tension adjustments, ne focus
wheel (11:1) compression t 1.25"
eyepiece adapter
One-Year Limited Warranty
This Orion product is warranted against defects in materi-
als or workmanship for a period of one year from the date
of purchase. This warranty is for the benet 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 returned postage paid. Proof of purchase (such
as a copy of the original receipt) is required. This warranty is
only valid in the country of purchase.
This warranty does not apply if, in Orion’s judgment, the
instrument has been abused, mishandled, or modified,
nor does it apply to normal wear and tear. This warranty
gives you specic legal rights. It is not intended to remove
or restrict your other legal rights under applicable local
consumer law; your state or national statutory consumer
rights governing the sale of consumer goods remain fully
applicable.
For further warranty information, please visit www.
OrionTelescopes.com/warranty.