Yeah, I figured the same focus points too. With birding it's always a juggling act, with a bit of luck thrown in.
Cheers Kev Nikon D810: D600 (Astro Modded): D7200 and 'stuff', lots of 'stuff'
I put your DOF calcs in for my D750 and the numbers are the same, I thought they would be different for full to crop bodies.
Regards John Nikon D750, Sigma 105mm OS Macro, Tokina 16-28 F2.8, Sigma 24-105 Art, Sigma 150-600C, Benro Tripod and Monopod with Arca plates
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