Mire calibration auto focus / Focus Calibration Chart
thingiverse
This tool will greatly help you to solve Front focus or Back focus problems which are sometimes (often) victims of the lenses of our SLRs, provided that your camera has the feature of micro-adjustment of the autofocus. I also attach the graphics in PDF to print on thick paper then glue, and the box that I modeled to store the Chart. Leveling tool (just over 2 €, not essential but very practical) https://www.amazon.com/dp/B075KHHXR8/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 Some sites where the procedure for using the target is explained. https://www.guide-color-management.com/exact-autofocus-adjustment-camera.html https://www.lesnumeriques.com/photo/exact-autofocus-adjustment-with-target-pu121951.html https://www.nikonpassion.com/back-front-focus-problem-test-spyder-lens-cal-datacolor/
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