Tried a few shots in the back yard today with my 200-500, 5.6 lens using the FTZ adapter... at 500mm/5.6 & handheld.. I was rather impressed with these few.. I used the 'pin' focusing on the little statue and that is quite sharp.
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Then a commotion in the tree ... a few sparrows squabbling amongst the branches... single point focus and very heavily cropped.
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Set to auto ISO with 'faster' for the lens focal length.So higher shutter speed, IBIS + VR... The Z7 seems pretty impressive