Bresser Messier 152r refractor auto focuser

[rodrigol]

The simple rack-and-pinion focuser on the Bresser Messier 152s is OK but inadequate for fine focus adjustments. I decided to see if I could adapt the 'cheap' Sky-Watcher Autofocuser to it. The first thing I noted was that the screws holding the focuser shaft against the focuser tube were all the wrong thread for the holes. These came out the hard way but did not strip the holes they screw in to.

The next challenge was to remove one of the focuser knobs. These are screwed to the shaft. A quick & hard turn loosened one so it came off :-)

Now I needed to see if the refractor adapter that comes with the auto focuser will work. Sadly, the whole assembly is too short, so I needed to elongate it. This I did with long screws and nuts to tighten everything. See the first picture below.

Finally, the focuser shaft was joined with the motor using the black flexible adapter that comes with auto focuser.

The second picture below shows I used long screws for the shaft box and how these allowed me to align the motor shaft and the focuser shaft. This adaptatio works but I need to test it as soon as the weather permits :-)

Enjoy and thanks for watching!

Sorry the last image is not rotated correctly.

[xtreemchaos]

nice job mate, ive been thinking about doing the same thing with my 127l, now i know how the knobs come off it will make it easyer.thanks.