Patent ID: 9030597
Filing Date: 2015-05-12
Classification: G03B,H04N

Abstract:
1. An interchangeable lens, comprising: a fitting unit that can be fitted to and removed from a camera body; an imaging optical system that has an aperture, and whose focal length is variable over a range from a first focal length to a second focal length; a focusing lens; a first transmission unit that transmits position information of the focusing lens to the camera body via a first transmission path; and a second transmission unit that transmits MTF characteristic data specifying MTF characteristics of the imaging optical system to the camera body via a second transmission path that is different from the first transmission path and is a full duplex transmission path, wherein: the MTF characteristic data is a plurality of MTF values, each MTF value corresponding to a combination of (1) one of three focal lengths, (2) one of two aperture F values, and (3) one of three image height positions; the three focal lengths are the first focal length, the second focal length, and a focal length intermediate between the first focal length and the second focal length; the two F values are a maximum aperture F value of the imaging optical system and an F value other than the maximum aperture F value; and the three image height positions are a position in a neighborhood of an optical axis of the imaging optical system, a position at an edge of a photographic field of the imaging optical system, and an intermediate position between the position in the neighborhood of the optical axis and the position at the edge of the photographic field.