Ricoh PENTAX K-3 Mark III Faq page 20

2) Select either 'Common' or 'Individual' settings and press the 'OK' button.
The illustration below shows when 'Common' is selected.
Common Apply the same adjustment value for all lenses
Individual Register the adjustment value only for the lens which is attached body
(Up to 20 models can be registered)
3) Press the bottom of the 4-way key to set the adjustment value to 'settable'.
4) From the result of step (4) above, increase or decrease the adjustment value as follows.
In the photo above, the adjustment value is '+4'.
・In the case of a back focus tendency...Move the index to the + side.
・In the case of a front focus tendency...Move the index to the - side.
5) After entering the adjustment value, press the MENU button to return to the shooting
screen.
'Individual' setting can be selected only when a compatible lens is attached to the body,
And the adjustment value will be enabled for the attached lens model.
(6) Return to step (1) and check the adjustment result.
By repeating step (1) to (6) above, you can adjust the focus position to your favorite lenses.
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