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

Claim 0:
1. A lens apparatus attachable to an image pickup apparatus, the lens apparatus comprising:
an imaging optical system; and
a lens controller including:
a communicator configured to, in a state where the lens apparatus is attached to the image pickup apparatus, transmit to the image pickup apparatus (i) depth-of-field information including (i.a) first information configured to allow the image pickup apparatus to calculate an absolute distance of a depth of field and (i.b) second information 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
a calculator configured to calculate the second information to be sent to the image pickup apparatus by the communicator, 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.