Focus Motor Installation for the RASA 36cm

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The Celestron Focus Motor is compatible with all units of

the 36 cm Rowe-Ackermann Schmidt Astrograph (RASA

36). However, some of the earliest units do not have the

correct focuser cover plate required to work with the

focus motor. This guide will help you determine if you have

the correct cover plate and walk you through the process

of switching the cover plate if necessary.

Identifying Which Cover Plate You Have

To begin, locate the focus knob on the RASA 36. The

cover plate is the orange ring encircling the focus knob.

The cover plate that is compatible with the Celestron

Focus Motor looks like this:

Note that this cover plate has four threaded holes for

mounting the focus motor.

The earliest RASA 36 optical tubes have a different

focuser cover plate without the four threaded holes. The

cover plate that is incompatible with the Celestron Focus

Motor looks like this:

For Customers with the

Compatible Cover Plate

If you have determined that you have the correct cover plate,

please follow the setup guide provided with your Celestron

Focus Motor to complete the installation. Start with step 7.

For Customers with the

Incompatible Cover Plate

If you have determined that you have the cover plate without the

four threaded holes, Celestron will supply the threaded cover

plate to you free of charge. Simply contact Celestron Tech

Support at celestron.com/pages/technical-support,

or call (800) 421-9649, Monday - Friday 8am - 4pm.

Replacing the cover plate is easy to do. First, remove the

rubber cover from the focus knob. If you cannot simply pull

it off, use a ﬂat head screwdriver or other tool to pry off

the rubber cover. Then, remove the six screws that hold the

cover plate in place and remove the existing cover plate.

Orient the new cover plate as shown below, then reinstall

the six screws.

Once the new cover plate is in place, follow the setup guide

provided with your Celestron Focus Motor to complete the

installation. Start with Step 7.

For All Customers

The four threaded holes in the cover plate provide two

different mounting orientations for the focus motor. For even

more motor mounting orientations, rotate the entire cover

plate by removing the six screws, re-orienting the cover

plate, and replacing the six screws.

Installing the Celestron Focus Motor (#94155) on the

36 cm Rowe-Ackermann Schmidt Astrograph

(#91077)

THREADED HOLE