Camera and lens calibration, or Autofocus Microadjustment, is a process that allows adjustment for front or back focusing autofocus errors. Even the highest-quality DSLR's are not manufactured to identical specifications. Because of these slight variations, combinations of cameras and lenses that aren’t exactly calibrated can result in errors in focusing.
Nikon camera bodies that are eligible for AF Fine Tune are:
D3, D3x, D3s, D300, D300s, D4, D4s, D5, D500, D600, D610, D700, D750, D800, D800E, D810, D810a, D850, D7000, D7100, D7200, D7500, Df
Canon camera bodies that are eligible for AF Micro adjustment are:
1Dx, 1DxII, 1DsMk III, 1DMk III, 1DMk IV, 5DMk II, 5DMk III, 5D MK IV, 7D, 7DMK II, 6D, 6D MK II, 50D, 70D, 80D, 5DS, 5DR
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