For optimal precision and performance, ContextCapture must group all photos taken by the same physical camera with identical focal length and dimensions (identical interior orientation) in one photogroup.

ContextCapture can automatically determine relevant photogroups if photos are organized in subdirectories according to the cameras used to shoot them: photos taken by different physical cameras (even if they are the same model) should be placed in separate subdirectories. Conversely, all photos taken by the same physical camera should be placed in the same subdirectory.