How to calibrate lens for sharpness at edge of frame?

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Fuiruboon New Member • Posts: 7
How to calibrate lens for sharpness at edge of frame?

Ive a d750 and am having problems getting sharp images when focusing at the edge of the screen . The centre focus points are fine but how do i calibrate the lens to keep the edge focus points sharp? It's particularly bad on the 70-200 f2. 8 lens. Any help greatly appreciated or tests that I can run. I've just had the lens serviced by nikon too.

Nikon D750
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