Thanks Sabyasachi Da for inputs. Let me try on it.
Another point is , shooting was in "One Shot AF" . Does this need to be changed in this scenario.
Also ,carried out a focus test with online available chart at approx. 45 Deg , both at 400mm/f6.3 & 100mm/f 4.5, wide open. Result enclosed & seems to be OK.
Regards/ Anil Kumar Verma
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