i did it with a standart cd marker pen. i didnt paint the lens, only a little bit of the silver ring witch i cleaned with alcoohol just fine. you have to be careful and stady hands. alcohol wont damage your lens, dont worry.
Ok, thanks. Just a last small question: Do you have by chance some kind of oleophobic coating protection on your lens? Because I have my lens full of fingerprints by daily use. I hope it's not because of the yesterday's mission, didn't pay attention before I played with alcohol.