@Jean-Pierre: It's a Tamron 28-75 f/2.8. http://www.tamron.de/index.php?id=417&kc_prid=20
My "all-the-time" -lens. It's very good and the price is very cheap for the performance of the lens.
Thanks for the comments my friends. :)
Just for curiosity, do you know anyone who has tried their 70-200mm f/2.8 lens? I am a little worried of it's handheld performance as it's lacks the image stabilization.