Moons of Jupiter, photos of Jupiter

I took my first ever planetary pictures of Jupiter yesterday, 1st November, 2011, using my DSLR (Canon 500d), 18-200 f3.5-5.6 lens, RedSnapper tripod, and a piece of card.

I set up the camera at 200mm, 2 second delay, f20 or so, and 3.2 second exposure, although the actual sensor exposure was less, and used Live View.

The reason being was I placed the card in-front of the lens as I took the shot, and only moved it out of the way when there was about a second left of the exposure.
The reason being was that I wanted any vibrations to die down before exposing the planet, so when I pressed the trigger, any vibrations should have died down after the initial trigger delay and the first few seconds that the sensor started to record information.

I'd then gently move the card out of the way near the end of the exposure, there by taking a shot of Jupiter with reduced or subsided vibrations.
I only knew about this technique after watching a BBC program on the night sky hosted by Brian Cox.

All in all, I only spent 10 minutes trying for the shot, so fairly happy with the result, and the fact that you can see four moons of Jupiter.

What do you think?