Thanks go out to all of you!! Donald: as that 70-200mm L lens would be capable for use of a 1,4x-converter, the focal lenght is sufficient, but as all other L-lenses, it is too expensive for me these days because i'd like to get it with IS (2000 Euro, 1850 via ebay). Maybe without L now and the 70-200 you do like that much (for a good reason!) in two years? @3DGuy and Misha: of course, i try to use a tripod, but it's not possible all the time, some of my "models" don't agree in waiting to get it mounted or at least standing still when i'm ready ;). Plus: how to use a tripod if i'd like to have some non-standard POV? One reason to get a IS-Lens :) @Michelle: you have been of great help for reassuring me that what i thought to "know" actually is true. Theses times, that really has value to me! Thanks!! :-) @Firestorm: good luck to you! If there's not plenty of money in your pockets, there are some difficult decisions ahead.