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Hey Bob....looks like you've stepped up your game with a 600mm II...congrats. My input is that you need to pick your priority subject and concentrate on maintaining focus there. In this case, it's probably the eagle?, and the fox is undoubtedly moving in and out of the focal plane. If this was shot at say 50 yards, your DOF @ 840mm, f/5.6 was about 3.8 ft, and would have been about double that @ f/11 (7.8 ft) So, at the settings you had, anytime the fox was more than 2 ft farther or closer than the eagle, it would be OOF. Take more images and hope to catch your ancillary subject in the focal plane, shoot more precisely when you think it's all in the focal plane - and / or adjust your aperture for more DOF. Or better yet, shoot a larger threesome of subjects - like a bear, a wolf and a caribou, which have to be four times farther away to fill the frame the same - then you'd of had over 30ft of DOF Sometimes your just not going to get everything you want at a given distance and focal length.
I would use back button focus on the eagle (once since he's not moving) and shoot away at different compositions when the fox looked right. You also have the option of focusing between the eagle and fox - and increasing the chance of both being within the focal plane....at the risk of neither.
If you're not using back button only focus....you should be
Best,
Jim
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