Sounds like you may wish to sell the 400 5.6L. If so, contact me cause me looking for one in 3 months time.lokewl said:I have use a 400mm f/5.6, found it very hard to hand-held and difficult to produce good un-blur pictures. So I have voted for the 300 IS with a 1.4x TC.
Pros of choosing a 70-200 IS + 2x over a 100-400L IS:Helbreath said:How about the 100-400L IS and 70-200L IS+2x?
I see.. thanks for your adviceAmfibius said:majere, make sure you "test drive" the Sigma before you buy it. I tested a Sigma 80-400 on my 10D and it was unusable. It would take a LONG time to focus, even in bright light, on stationary objects. Want to track a car? Running animal? Bird? Forget it.