Celestron Feathertouch SCT Microfocuser Manual de usuario

Installation Instructions – Celestron 11” Telescopes

Important:

The telescope optical tube must be positioned horizontally before

removing the original focus assembly. If the telescope is not horizontal the primary

mirror could move during the installation.

Required Tools: Phillips Screwdriver

1/16” Hex-Head Wrench (Not required for NexStar 11 GPS)

Step 1

Remove Focus Knob

NexStar 11 GPS telescopes have a rubber knob which can be pulled off. Older 11"

telescopes will have a metal focus knob which must be removed using a 1/16” hex-head

wrench to loosen a small set screw. Once the knob is removed you will see the brass

focus shaft as shown below.

Step 2

Move Primary Mirror Back

Turn the brass focus shaft clockwise to bring the mirror back and expose the Phillips-

head screw at the end of the threaded focus rod.

Step 3

Remove Set Screw

Use screwdriver to remove the small Phillips screw from the end of the threaded focus

rod.

Step 4

Remove Focus Assembly Cover Plate

Use screwdriver to remove three screws from the focus assembly cover plate (the three

screws around the outside of the focus shaft). Remove the cover plate. Hang on to the

three Phillips screws as they will be used to attach the SCT MicroFocuser.

Step 5

Remove Focus Bearing Assembly

Turn the brass focus shaft counterclockwise to remove it from the threaded focus rod.

This will take quite a few turns. Once the bearing assembly is removed, only the

threaded focus rod (which pushes and pulls on the mirror cell to focus the telescope) will

be left sticking out of the telescope as below.

Step 6

Thread on SCT MicroFocuser

Begin threading the SCT MicroFocuser onto the threaded focus rod.

When there is only about 1/4" left to go, simply push the focuser the rest of the way in.

This will take up some of the change in focus from when you removed the original

focuser, making it quicker to return to focus the first time you use your telescope after the

SCT MicroFocuser installation.

Step 7

Attach the SCT Micro Focuser

Use the three original Phillips screws to attach the SCT MicroFocuser to the telescope.

You are now ready to head out under the stars!

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