Ricoh PENTAX K-3 Mark III Faq page 18

Live view:
Q: How to set the AF Fine Adjustment?
A: You can set AF Fine Adjustment following the procedure below.
■Setting procedures of AF Fine Adjustment
1. Preparation
Camera, Lens, Object(Chart)*
*As below sample, prepare the flat chart which has a clear contrast of black and white and
place it to parallel with the camera.
Caution: Following object and method of capturing are not suitable for AF Fine Adjustment.
・Objects which have depth. .
・Spherical objects where the focus point can easily change.
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