@tameside: It's a +3 achromat, maybe I'll add a +5 to my arsenal as well in the future.
@seiko: The shots are done with manual focus set to nearest distance in A-mode. Then basically just like any other macro shot I go focus hunting by moving the camera forth and back. You have a blazing fast camera, so why not use it ? So, at 10-20fps there's always a few shots that are steady and in focus at the same time.
If you want to see more close-ups I can post some, no prob. I think I have gotten more in 2 months with the F1 than with my old cam in 2 years.