canon816:
I've been contemplaring the 200-400 since it's development announcement. However, since then, the 400mm f2.8II was announced and at probably the same price as the 200-400. The ver 1 of the 400 is certainly a heavy lens, but the ver II is the same weight as the 500mm f4 IS ver 1 which I own. Notwithstanding the versatility of the zoom, it's the ultimate aperture of the 200-400 that is my issue and as a result, difficult for me to decide on the 200-400 over the 400mm f2.8 II.