Patent ID: 11930269
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 8:
9. A control method of a lens apparatus attachable to an image pickup apparatus and configured to send first information and second information to the image pickup apparatus, the control method comprising:
calculating, by the lens apparatus, the second information;
acquiring, in a state where the lens apparatus is attached to the image pickup apparatus, (i) depth of field information including (i.a) the first information, the first information being configured to allow the image pickup apparatus to calculate an absolute distance of a depth of field, and (i.b) the calculated second information, the calculated second information being configured to allow the image pickup apparatus to calculate a normalized depth of field by normalizing the calculated absolute distance of the depth of field into a display format of a display unit of the image pickup apparatus so as to allow the image pickup apparatus to display the calculated normalized depth of field together with a distance display bar on the display unit of the image pickup apparatus, and the calculated second information including a coefficient of an approximate expression used to normalize the calculated absolute distance of the depth of field in an in-focus range calculated with the first information so as to display the calculated normalized depth of field on the display unit; and
transmitting, in the state where the lens apparatus is attached to the image pickup apparatus, the first information and the calculated second information to the image pickup apparatus.