SkyWatcher Heritage 130P FlexTube Dobson should also be adjusted with a Cheshire adjustment eyepiece.

The SkyWatcher Heritage 130P FlexTube Dobsonian should also be adjusted with a Cheshire adjustment eyepiece.

Due to the single-arm secondary mirror mount, this can become misaligned or twisted.

The more precisely the secondary mirror is adjusted, the better the telescope's image will be.

The focuser (here a helical focuser) should be turned out slightly, as it has some thread play.

We adjust every telescope before shipping (we package the Heritage very securely with additional packaging) or pickup, so you generally don't have to do this again.

http://www.teleskop-spezialisten.de/shop/Teleskope-fuer-Einsteiger/Skywatcher-Heritage-130P-130-650-Newton-FlexTube-Dobson-mit-Zubehoer::356.html