I got the new 600mm f/4 II on Thursday but hadn't gotten a chance to use it out in the field until this morning. Inspired by Arash, I paid a visit to some local Burrowing Owls. When I arrived there were a couple of birds standing outside their burrows, and the light was decent. I spent the next hour and a half photographing the owls. The new 600 is a featherweight compared to the old one! I'm not prepared to make a call on AF because Burrowing Owl flight against a varied BG is one of the toughest BIF shots you can get; the keeper percentage is quite low. Plus I was using a 1.4x for this frame, and the TC measurably slows AF down. In spite of the challenges, I came away with my best Burrowing Owl flight shot ever, so I was pretty happy!
