That's the trick - get 'em while their stomach is full. You must have a really serious lens - I can't believe you can capture that much detail with a small lens.
I shot that one with a D3 and a 70-300mm f/4.5-5.6G VR. The VR really helps.
But here's another with a D2X in December, 2007. I shot this with a 24-120mm f/3.5-5.6G VR, which isn't nearly as sharp a lens as the 70-300. I really got lucky with this guy. I walked up almost close enough to step on him before I could get him to fly. Then I tracked him and made three good shots before he landed again on down the river. I got incredibly lucky and tripped the shutter just as he passed the sunspot on the water. It's one of my all-time favorites (other than my favorite street shots of course).
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VR's a lot of help, but Nikon's new 24-70mm f/2.8G isn't VR and it's given me some of the sharpest pictures I've ever made-- even sharper than some of the Leica shots I made back in the sixties with a Summicron F/2. Like this one:
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I'm going to keep on trying to get the cardinal the way you got the sparrow. Don't have much longer to try, though. On Saturday we're leaving Florida to go back to Colorado. We're going to do an 1,800 mile trip in 6 days -- all on back roads through hundreds of little towns -- 300 miles a day with plenty of time to stop and shoot pictures.
Best regards,