Imgs taken by auto focus, calibration tool only estimate one focus

[JimXu]

Hi,
I use auto focus mode to capture an object in difference distance, the calibration tool only estimated one camera focus, is that the mean focus?
When I use my phone camera in manual focus mode, the estiamted focus are more than one.

[tazzo]

Hello Jim,

Focus is always a single plane because the sensor is planar.

Would be better if you shoot in manual focus at different distances and you create a camera group for each distance. Keep in mind that to estimate the camera parameters you need many photo at each distance.

The best scenario I guess is to use fixed focal / fixed focus in a spherical way around the object to always have the same distance.