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FOCUS MOTOR FOR SCT & EDGEHD INSTRUCTION MANUAL
FOCUS MOTOR
FOR SCT & EDGEHD
INSTRUCTION MANUAL
ENGLISH • MODEL #94155
The Focus Motor for SCT & EdgeHD provides
hands-free focusing for Celestron Schmidt-
Cassegrain telescope (SCT) and EdgeHD telescope
optical tubes. This is a great convenience, especially
for astroimagers with remote telescope setups and
people who have dexterity issues that limit their ability
to use a focus knob.
The focus motor is compatible with all Celestron
SCTs from 6" to 14" in aperture that have
been produced since the year 2006; it is not
compatible with 5" SCTs or older models. It is
compatible with all EdgeHD optical tubes, the 8" and
36cm Rowe-Ackermann Schmidt Astrograph (RASA)
models, and the Celestron 7" Maksutov-Cassegrain.
The focus motor can also be used with the 11" RASA,
but requires the Focuser Retrofit Kit for the RASA 11
(#94255).
CHECKING CLEARANCES
The focus motor protrudes outward from the rear cell
of the telescope. After installation, check to make
sure the focus motor does not interfere with the
telescope's mount as it points to different parts of
the sky. Specifically, if using a fork mount that has
adjustable positioning of the optical tube on the fork,
such as the NexStar SE and NexStar Evolution mounts,
make sure the focus motor does not interfere with
the mount when pointed straight up (or at the pole if
using an equatorial wedge).
If it does interfere, simply reposition the telescope on
the fork mount until the focus motor clears the base.
The telescope may be a bit out of balance, but it should
not affect performance.
To prevent interferences, the focus motor orientation
relative to the telescope's rear cell can also be changed.
This is done by using a different set of mounting holes
to mount the focus motor onto the focuser cover plate,
or by rotating the cover plate itself. Refer to the Setup
Guide for more information.
1
I
ENGLISH
If using a Celestron computerized mount, the focus
motor can be powered by the mount, and allows
focus control from the telescope's hand control
or from a computer connected to the mount. If not
using a Celestron mount, the focus motor can be
controlled directly by a computer via a USB cable,
and is powered by the USB connection or an optional
12V DC power supply.
Please read through the entire instruction manual
before attempting to use the focus motor. The
manual will guide you through the various methods
of powering and controlling the focus motor. For
installation instructions, refer to the Setup Guide
included with the focus motor.
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Summary of Contents for Celestron 94155
- Page 1 If not for astroimagers with remote telescope setups and using a Celestron mount, the focus motor can be people who have dexterity issues that limit their ability controlled directly by a computer via a USB cable, to use a focus knob.
- Page 2 Once connected, you can use most any astronomy telescope control software that focuser control by using the Celestron Unifi ed ASCOM mount driver, which can be downloaded from ascom-standards.org. The focus motor controlled by a computer through a Celestron mount. ENGLISH...
- Page 3 USING THE FOCUS MOTOR WITHOUT A CELESTRON MOUNT If you are not using a Celestron mount, the focus motor can be powered and controlled via the USB port. This can be done by connecting it to a USB3 port or a USB2 port that provides at least 900 mA.
- Page 4 The focus motor can be calibrated using any of the above methods and will not need to be done again if changing To calibrate using a Celestron hand control, press the how the focus motor is controlled. For example, you can MENU button, then select “Focuser, ”...
- Page 5 You can go to a specific focuser index position by using a “Move To” command. If using a Celestron hand control, press MENU and select “Focuser”, then “Move To. ” From here, you can enter a focuser index position and the motor will automatically slew to that position.
- Page 6 Repeat this procedure until the focus of the telescope immediately changes when changing direction In the Celestron hand control, the backlash setting can of the focus motor. If you set the backlash setting too be found by pressing the MENU button, then selecting high, you will notice the focus rapidly changing as soon “Focuser, ”...
- Page 7 NOTE: This warranty is valid to U.S.A. and Canadian customers who have purchased this product from an authorized Celestron dealer in the U.S.A. or Canada. Warranty outside the U.S.A. and Canada is valid only to customers who purchased from a Celestron’s International Distributor or Authorized Celestron Dealer in the specific country. Please contact them for any warranty service.
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