1. An image capturing apparatus comprising: an optical low-pass filter configured to separate one incident ray into multiple rays to form multiple point images; and an image sensor configured to photoelectrically convert the multiple point images, wherein the optical low-pass filter satisfies the following condition: 
 0.4<2×σ/ P< 0.9 where P represents a pixel pitch of the image sensor, and σ represents a standard deviation of a distribution of the multiple point images.