Hi :) After lots of postings, readings and taking closer looks to test-pictures, my telezoom-lens-question is reduced to two options. CANON EF 70-200/2,8L IS USM with Canon 2*-Converter or CANON EF 100-400/4,5-5,6L IS USM The second is cheaper but i don't know if this pull-push-zoom works good for me. And (what is more important), the first one for sure is the better solution in the 70-200-range (without converter). The only remainig question is: at 400mm focal lenght, can the 70-200*2 compete with the 100-400mm? Some pics say "yes" .. other people tell horrific things of that converters ... so i'm asking you ... any ideas? Thx in advance! Tom :)