My last try to get a picture of the moon was not really rewarding.

It looked like this:

The Moon

Today, I took my new 100-400 lens with an extender 2x, this gives you a total of 800mm on the lens. But, on the Canon EOS 40d you end up with 1280mm due to a 1.6x FOV

Anyway enough of the technical part, the result looks like this:

The Moon with a 800mm lens

And as would sing Katie Melua; Blame it on the moon !

ps: the picture was not taken with a tripod!