I received some suggestions from Franz Keller:

-         always use a tripoid, even wehen the exposure time is very short.

-         don´t use zoom-lenses

-   the moon should be high in the sky, not close to the horizon

-   full moon is not so interesting. In the days before ore after first quarter the craters have long shadows

-  turn off the auto-focus

- to control the focus use the life-view of your camera or a laptop screen

-  focal length should be minimum 500mm, better 1000 mm

To see Franz's moon pictures, click on http://www.volkssternwarte-gundremmingen.de/vsg.htm