Quote:
Originally Posted by M_Six
The Sigma is quite sharp, but that weight makes it almost useless at airshows, which is why I want the 100-400. If I only shot sports, I'd stick with the Sigma. But for airshows and BIF shots, it's time to go lighter. I'd look into a 500/4, but I don't do BIF all that often, so I can't justify the investment right now.
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The 100-400 with the 1.4x TC-III responds quick enough for BIF on the 7D MkII and higher bodies. It's much better in this regard than the 400/5.6 and the Series I 100-400. For the occasional BIF shooter, I think that the 100-400 II is the way to go, on the Canon side.