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These are *really really good*. Not just a bit good. I'm jealous, particularly of the dragonflies, I've been trying to capture them in flight too with no luck -- did the autofocus on the 7D help, or was it just photographer's instinct?
The dragons were just lucky my friend. They would zip by, then hover for 1 second. Then zip away. The 8fps of the 7D IMHO is what got me the shot. I just traced the flight path as best I can and when they hovered, the AF locked on and got them!