Centering the focuser of a refractor

An alignment laser can be used to adjust the centering of a refractor telescope's focuser.

To do this, the lens cell is removed and the tube is placed on a simple mirror. The decentration is removed by tilting the OAZ adapter to the tube and secured with a Teflon strip.

See also: http://www.teleskop-spezialisten.de/shop/Ueber-uns:::12.html