Meade ETX-105EC Operating Guide

The Meade #1244 Electric Focuser rapidly
focuses eyepiece images in all ETX-90 and ETX-
105 telescope models. The #1244 includes coarse
and microfine speeds. The standard-equipment
focuser 3-button hand controller accepts one user-
supplied 9-volt battery. 

If used with an ETX-EC Astro Telescope, the
focuser functions are controlled directly with either
the Electronic Controller (standard with the ETX-
90EC or ETX-105EC) or with the optional #497
Autostar Computer Controller, rather than with the
Focuser 3-button hand controller.

When opening the packing box for the first time,
carefully note the following parts:

•

Electric focuser gearbox with attached coiled
cord

•

Electric focuser 3-button hand controller

•

Packed in a poly bag:

1.75”-long hex-head screw

1” diameter brass focusing gear

Mounting plate

Hex-wrench set (3 wrenches)  

To attach the #1244 Focuser to the telescope:

1.

Use the medium hex-wrench to remove the
hex-head screw (1, Fig. 1) from the rear cell of
the telescope. The screw is located above and
slightly to the left of the focus knob (2, Fig. 1).

2.

Use the small hex-wrench to loosen the set
screw on the telescope’s focus knob (2, Fig.
1); remove the knob.

3.

Slide the center hole of the mounting plate
(2, Fig. 2) over the focus shaft, so that the
flat side faces the body of the telescope
and the upper hole is aligned with the hole
from which the hex-head screw was
removed in step 1. 

4.

Place the focusing gear (1, Fig. 2) on the
focus shaft (3, Fig. 2) so that the hub of the
gear faces the body of the telescope and the
gear is approximately flush with the rear of the
shaft. Tighten the set screw on the focusing
gear with the small hex-wrench.

5.

Carefully place the electric focuser gearbox 
(4, Fig. 2) over the focusing gear. To orient the
gearbox, the attached coiled cord should be
on top. Slide the gearbox shaft into the hole
from which the hex-head screw was removed
in step 1. The focusing gear (1, Fig. 2) fits into
the round slot in the gearbox.

®

Fig. 2: Installation of the #1244 Electric Focuser. 
(1) Focusing gear; (2) Mounting plate; (3) Focus shaft;
(4) Focuser gearbox; (5) Hex-head attachment screw.

4

Fig. 1: Rear Cell of Telescope.
(1) Hex-head screw; (2) Focus knob.

1

3

5

2

1

2