Installation Instructions – Celestron CPC-800 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.

Parts List:

Feathertouch SCT MicroFocuser(3) M3-0.5x10 Hex-Head Screws
2.5mm Hex-Head Wrench

Additional Required Tools:

Phillips Screwdriver
Wrench: ½” or adjustable

Step 1 Remove Focus Knob

Begin by removing the black rubber focus knob from the scope. This knob simply pulls
off the brass focus cylinder.

Step 2 Remove Focus Assembly Cover

There are 3 small Phillips-head screws which hold the orange focus assembly cover inplace. Remove these screws and take off the flat cover plate, exposing the inside of thefocus assembly.

Step 3

Move Mirror Back to Expose C-Clip or Screw

Rotate the brass portion of the focus assembly clockwise. This will bring the mirror backand expose the threaded portion of the focus shaft. At the tip of this threaded bolt will beeither a small C-clip or a Philips-head screw and washer which will be removed in thenext step.

Step 4 Remove C-Clip or Screw

The C-clip at the end of the focus shaft must be removed to install the SCT MicroFocuser. The clip should be removable by hand, but you may use needle-nose pliers or asimilar tool if necessary. Be careful not to scar the threads of the focus shaft as the SCT
MicroFocuser must be threaded on in a later step. If your telescope has a screw andwasher, simply remove these with a screwdriver. Keep these parts handy; they will bereinstalled later.

Step 5 Remove Focus Bearing AssemblyRotate the brass portion of the focus shaft counterclockwise. This will unthread the brass
cylinder and bearing assembly from the threaded rod. Remove these parts entirely (youwill have to turn the brass shaft quite a few times to remove it).

Step 6 Remove Brass Stop from MicroFocuser

Unthread the brass stop from the end of the MicroFocuser. This stop prevents thetelescope mirror from falling off the baffle tube inside the telescope. Thread the stop
onto the focus shaft of the telescope. Be sure to thread the stop on far enough that theend of the threaded rod is exposed.

Step 7 Reattach C-Clip or Screw

Snap the C-clip back onto the end of the threaded rod or thread the screw back in. Notethat the C-clip fits into a small groove about 3 threads in from the very tip of the threadedrod. If your scope has a washer and screw, put these back in place on the focus shaft.

Step 8 Attach MicroFocuser to Stop

Thread the MicroFocuser into the brass stop. Hold the stop with a wrench and the black
focus knob with the other hand to tighten the stop. This stop MUST be tight to secure
the MicroFocuser to the focus shaft.
Thread the focuser down the threaded rod until the base sits flush with the back of thetelescope. If it does not thread all the way down, push it forward to move the position of
the primary mirror, allowing the focuser to fit against the back of the scope.

Step 9 Attach the SCT MicroFocuser

Use the three provided hex-head screws and wrench to attach the SCT MicroFocuser tothe telescope. You are now ready to head out under the stars! Use the black knob forcoarse focus and the brass knob for fine focus (10:1 ratio). Note that the telescope will
likely be pretty far out of focus, so you may need to turn the focus knob quite a few times
to reach focus.