jcolwell Offline Upload & Sell: On
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I had a 1DIV when I got my 100-400L IS (Mk I) in 2012 and then I added a 1DX. I was generally very happy with the sharpness that it provided. I sold the 100-400 Mk I to help pay for a new Mk II this past winter, and it's better, especially for handheld shooting at lower shutter speeds, and away from the centre. My 100-400 Mk I was always plenty sharp in the central parts of the image, on 1DIV, 1DX, and 6D.
The 1DIV brings a few new considerations to the table: (i) it's a higher density sensor than the 1DII (87 ppmm vs. 61 ppmm), and so it'll be more sensitive to showing 'blur' at 100%; (ii) it has a more complex AF system, with more setup options; and (iii) the 1DIV has AF microadjustment (AFMA).
Have you done AFMA tests with the 100-400L IS + 1DIV? If not, that's where I would start.
The minimum shutter speed depends a lot on your shooting style and how well you can track a moving target. I generally shoot BIF with IS turned off. In some cases with horizontal or vertical flight (relative to the photographer) Mode 2 can work OK, but it can hinder you if the bird flies an erratic or 'diagonal' path with respect to the photographer.
It might be worthwhile to perform some controlled tests with the lens on a tripod (IS off), and use LiveView manual focus to get critical focus on a flattish target with good 'granularity' (e.g. a brick wall). That'll show you what the lens + camera is capable of providing for sharpness. If it still doesn't look sharp, maybe it neeeds some TLC at a Canon service centre.
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