Spent an hour yesterday playing with my 1DX MK II in the field. It was dark and rainy with not much activity. I found this green heron that gave me a few passes to try some flight shots. I noticed that the AF was significantly better than the 1DX at f/8. I was using my 400 DO II + 2X III. I got many sharp frames of the green heron zipping through the field. With the 1DX I would have gone a few frames sharp under this condition but the 1DX II seemed much more consistent
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1DX II 400 DO II + 2X III. ISO 5000. f/8 at 1/2000sec. dismal light! processed with DPP 4.4