Quote:
Originally Posted by dcstep
The Sigma is okay, but the Canon 100-400 II is exceptional and it works really well with the 1.4x TC-III. The 400/5.6 doesn't have IS. It's sharp and fast focusing, but slows down way more than the 100-400 II when you add the TC.
Dave
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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.