How to Easily Understand (And Use) Lens Calibration
JJC Professional Camera Lens Auto Focus Calibration Tool,Help Fine Tune Focus of Lens via Select DSLR Camera That has AF Fine Tune/AF Micro Adjustment Function to Achieve The Greatest Image Sharpness :
EOS 7D AF performance for BIF
Canon EOS 7D Mark II Update... - Reikan FoCal Blog Automatic Lens Calibration Software