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 (3.65" diameter) in
the telescope for the bottom of the focuser. Be careful not to
cut your fingers 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 70mm (without the
1.25" eyepiece adapter attached), so if your eyepieces reach
focus closer to the tube than this, additional modifications to
the telescope may be required.
Usage
Using the 2" Crayford focuser is very straightforward. Place
your 2" eyepiece in the focuser drawtube, and secure it in
place with the two thumbscrews. 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 thumb-
screw is loosened when focusing.
The socket head set screw below the focus lock thumbscrew
adjusts drawtube focusing tension (see Figure 1). If a heavy
eyepiece causes the drawtube to move inward by itself
(drawtube tension too loose), or the focus wheels are diffi-
cult to turn (drawtube tension too tight), then you will want to
adjust this set screw. This requires the 3mm hex key.
The 1.25" Eyepiece Adapter
In order to use a 1.25" eyepiece in the focuser, you must first
install the 1.25" adapter. Place this adapter into the drawtube
like a 2" eyepiece, and secure it with the two thumbscrews on
the drawtube. Insert a 1.25" eyepiece into the adapter, and
secure the eyepiece with the thumbscrew on the adapter.
Collimation
The focuser has three pairs of socket head set screws and
socket head cap screws located on the base of the focuser
(see Figure 1). These “push-pull” screw pairs can be used
to tilt the focuser relative to the telescope tube for optical
collimation purposes. While these generally need no adjust-
ment, they are provided for extra convenience in case the
need should arise.
Optional Accessories
Some Newtonian reflectors, specifically Orion’s 8-inch f/4.9
or 10-inch f/4.7 reflector telescopes, will require a longer 2"
eyepiece adapter for visual use with the Crayford focuser.
Without this optional adapter, you will not be able to reach
focus with eyepieces in these telescopes
To attach a SLR camera or digital imager featuring T-threads
directly to your focuser, an optional camera adapter is avail-
able from Orion.
You can also add convenient and precise electronic control
to your Crayford focuser with the Orion AccuFocus electronic
focuser.
Contact Orion Customer Service for ordering information.
Specifications
Focuser design: Crayford, accepts 2" eyepieces
and 1.25" eyepieces with included
adapter
Minimum focus height: 70mm without 1.25" adapter,
80mm with 1.25" adapter
Focus travel: 40mm
Other features: Focus lock, drawtube focusing
tension adjustments, collimation
adjustments
One-Year Limited Warranty
This Orion 2" Crayford Focuser for Newtonian Reflectors 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 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. If the product is not
registered, proof of purchase (such as a copy of the original invoice) is required.
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 specific legal rights, and
you may also have other rights, which vary from state to state. For further warranty service information,
contact: Customer Service Department, Orion Telescopes & Binoculars, 89 Hangar Way, Watsonville,
CA 95076; (800)-676-1343.
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