The Tammy is still a good lens for the price. I use it a lot when chasing trains, and it worked very well at the zoo and in Yosemite. It is not good as a bird in flight lens due to a frustrating auto focus on moving targets. It was on my 7D and I just happened to grab the 5D with the dust pump on it. This shot was more opportunity, as I was down at a fishing pier on the bay and it just flew over me. I actually had the 700mm setup on the 1D in the car, and I wish I had it at that moment. I may go back later in the week with the heavy artillery and see what happens.
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