| 摘要 |
PROBLEM TO BE SOLVED: To attain an inexpensive imaging device that reduces degradation of an image quality due to an optical aberration when a subject image is in an in-focus state.SOLUTION: An imaging device comprises: an image pick-up element that is arranged at a location where a light flux of an imaging lens optical system to be interchangeably mounted forms an image, and acquires image data by a photoelectric conversion; an optical element that is arranged obliquely relative to an optical axis between the lens optical system and the image pick-up element, and causes one part of an incident light flux to be reflected and transmits one part thereof; focus detection means that calculates a focus detection evaluation value in a plurality of division ranges on an image pick-up plane using the image data obtained on the image pick-up plane; optical aberration calculation means that calculates an optical aberration on the image pick-up element on the basis of optical information on the imaging lens optical system and the optical element; weight coefficent calculation means that calculates a weight coefficient of each division area on the image pick-up element on the basis of an optical aberration result; and ranging frame selection means that determines the division range where the lens optical system is focused on the basis of a result having the focus detection evaluation value corrected by the weight coefficient.SELECTED DRAWING: Figure 1 |
