JP2008275712A5 - - Google Patents

Claims (7)

An imaging device in which an imaging lens can be attached and detached,
An image sensor that photoelectrically converts a subject image formed by the imaging lens;
Focus detection means for generating defocus information according to the shift amounts of a plurality of images formed by light from the imaging lens;
Based on the focus evaluation value information according to the first focus processing for obtaining the in-focus position of the imaging lens based on the defocus information and the contrast of the image obtained by using the imaging element, the imaging lens is adjusted. Control means for performing a second focus process for obtaining a focal position;
The focus detection means includes first defocus information corresponding to a shift amount of the plurality of images formed by light in the first wavelength range, and a second wavelength range narrower than the first wavelength range. Detecting second defocus information corresponding to a shift amount of the plurality of images formed by light,
The control means includes a first defocus information, a first position corresponding to a difference between a focus position obtained based on the second defocus information and a focus position obtained in the second focus process. An image pickup apparatus that performs focus control of the image pickup lens using the correction information. The control means acquires second correction information related to a focus shift due to chromatic aberration of the imaging lens from the imaging lens,
The imaging apparatus according to claim 1, wherein the focus control is performed using the first defocus information, the first correction information, and the second correction information.   The imaging apparatus according to claim 1, wherein the second wavelength range overlaps a part of the first wavelength range. The control means acquires identification information for identifying the imaging lens from the imaging lens,
The imaging apparatus according to any one of claims 1 to 3, further comprising a storage unit that stores the first correction information in association with the identification information. The focus detection means includes an optical filter having a higher transmittance for light in the second wavelength range than that for light in the other wavelength ranges, and the optical filter is disposed outside the optical path to place the first filter in the first wavelength range. The imaging apparatus according to claim 1, wherein defocus information is generated, and the second defocus information is generated by inserting the optical filter into an optical path. The focus detection unit includes a first light receiving sensor that detects the shift amount in the first wavelength range, and a second light receiving sensor that detects the shift amount in the second wavelength range. The imaging device according to any one of claims 1 to 4, wherein A control method for an image pickup apparatus in which an image pickup lens can be attached and detached,
A detection step of generating defocus information according to a shift amount of a plurality of images formed by light from the imaging lens;
It said first focusing processing based on the defocus information obtaining the focus position of the imaging lens based on the focus evaluation value information corresponding to the contrast of images obtained using及beauty IMAGING element of the imaging lens A control step for performing a second focus process for obtaining a focus position,
In the detection step, first defocus information corresponding to a shift amount of the plurality of images formed by light in the first wavelength range, and light in a second wavelength range narrower than the first wavelength range. The second defocus information corresponding to the shift amount of the plurality of images formed by the step is detected, and obtained in the control step based on the first defocus information and the second defocus information. A method for controlling an imaging apparatus, wherein focus control of the imaging lens is performed using first correction information corresponding to a difference between the in-focus position and the in-focus position obtained in the second focus process. .