The funny thing is, I was just shooting some birds on a bayou with my Nikon D100 with 400mm f/5.6 Sigma alongside my 40D with 28-135mm yesterday at "golden hour", andIhave become a little disenchanted with the AF of the Nikon/Sigma combo in less than full daylight, so I have been considering selling the whole kit andbuying a Canon tele with the money. While I was shooting, though, I also realized that some of my shots really needed much more than 400mm, so Iam kind of nervous about a 300mm, which is obviously shorter. Being limited by available funds, I want to make my next lens be as flexible as possible, but with outstanding IQ.
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