How often should I check or calibrate my camera / lens auto focus?
We suggest once calibrated you should re-calibrate a particular lens/camera combination every 6-12 months depending on how much you use your camera. Camera and lens parts wear and if used heavily calibrating more often can be useful.
These is evidence to suggest that micro adjustment or fine tune calibration values can be affected by extremes of temperature. Checking or re-calibrating closer to the temperature you will use the camera/lens can be beneficial. Locations which see large seasonal temperature variation it's worth considering calibrating as the seasons change.
If a camera or lens is dropped or subjected to harsh treatment checking calibration may be used as a way to assess the general function and health of the camera/lens. Auto focus calibration won’t identify all possible issues but may provide some confidence measure that a camera/lens is behaving normally.