My problem is the focus. A lot of pictures turn out blurry. Espcially those of airplanes seen from the side.
For example: http://fsmat.at/~berni/example.jpg
However, frontal views fullfill the airliners' criteria:
Photo © Bernhard Dallner
It doesn't seem to matter whether I use a long or a short shutter speed.
I would be thankful for your help.