Installing a Moonlite CS1-TM Focuser with Motor Focus option on a Takahashi Mewlon 180

Page 1 of 3 Revision A, 10th

October 2007

This documents and describes how I fitted a Moonlite CS1-TM with Motor Focus option to myTakahashi Mewlon 180 threaded visual back. The photos and steps described below are how it workedfor me, on my ‘scope, during my installation. This “how to” is not authorative advice on doing this.

NOTES: The Mewlon 180 is the smallest OTA in the Takahashi Mewlon stable and required the

removal of the Finder eyepiece. This is a simple operation, it easily unscrews (see Figure 6). The only tools required were a 1.5mm Allen Key to remove the Tak Focus Knob and a 3mm

Allen Key to adjust and lock the Moonlite Focuser angle adjustment grub screw. For the M180, ensure your work surface allows the Focuser end of the OTA to overhang, so

the Moonlite Focuser to be rotated 360O whilst it is being screwed onto the OTA. Make sure you engage both threads of the Tak Focus Shaft when re-fitting the Tak Focus

Knob. See Figures 7 & 8 for detail.

Figure 1 Figure 2This is a view of the M180 showing the focuser with the Tak2” Visual Adapter, Tak 1 ¼ Adapter and Focus Knob fitted.

Peel back the rubber sleeve on the Focus Knob, approx ½way, to reveal 3 grub screws (1.5mm Allen Key). Refer toFigure 7 for close up detail.IMPORTANT: Back off the grub screws sufficiently to clearthe internal thread in the Focus Knob body.

Figure 3 Figure 4Unscrew (CCW) the Tak Focus Knob from the Focus Shaft.Here is the Focus Knob removed with the 1.5 mm Allen Key.

Here are the Tak Visual Adapters removed from the Takthreaded visual back with the Tak Focus Knob also removed.

Installing a Moonlite CS1-TM Focuser with Motor Focus option on a Takahashi Mewlon 180

Page 2 of 3 Revision A, 10th

October 2007

Figure 5 Figure 6For the M180, unscrew the Tak Finder eyepiece to allowMoonlite Focuser with Focusing Motor to rotate.

Tak Finder eyepiece unscrewed to provide clearance forMoonlite Focuser Assembly to be rotated and screwed intoplace.

Figure 7 Figure 8Detail of Tak Focus Knob showing the rubber sleeve peeledback to expose the grub screws. Note that the grub screwsare backed out a long way to clear internal threads of FocusKnob and Focus Shaft. A 1.5mm Allen Key was required.

Detail of Tak Focus Shaft after the Focus Knob has beenremoved. Grub screws bear against the flat surface betweenfront and rear threads on Focus Shaft.

Installing a Moonlite CS1-TM Focuser with Motor Focus option on a Takahashi Mewlon 180

Page 3 of 3 Revision A, 10th

October 2007

Figure 9 Figure 10Moonlite Focuser fitted. Now we can re-fit the Tak Finder scope eyepiece.

Figure 11 Figure 12Tak Finder scope eyepiece re-fitted and Moonlite Focuserassembly rotated to my preferred position to allow OTA to bestored in my existing, home made wooden transport case.

Tak Focus Knob re-fitted. Moonlite Focuser rotated to yourpreferred position and locked using a 3mm Allen Key.