FOCUS MOTOR FOR SCT & EDGEHD INSTRUCTION MANUAL
1 I ENGLISH
The Focus Motor provides hands-free focusing for
Celestron Schmidt-Cassegrain (SCT), EdgeHD,
and Rowe-Ackermann Schmidt Astrograph
(RASA) 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 telescopes. It is compatible with 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 if it has the FeatherTouch MicroFocuser installed,
then it will require the Focuser Retrofit Kit for the
RASA 11 (#94255).
For 6” Schmidt-Cassegrain telescopes only, the Off-
Axis Guider (#93648) cannot be used when the focus
motor is installed due to mechanical interferences.
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.
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.
FOCUS MOTOR
INSTRUCTION MANUAL
ENGLISH • MODEL #94155-A
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