Patent ID: 8063977

Claim:
A photosensor comprising: a first focus-detecting sensor and a second focus-detecting sensor configured to receive a light beam from an object so as to detect a first defocus amount of an imaging optical system from a pair of received optical images; a third focus-detecting sensor and a fourth focus-detecting sensor configured to receive the light beam from the object so as to detect a second defocus amount of the imaging optical system from the pair of received optical images; a first light detection sensor configured to detect a wavelength component of the light beam for detecting a light source that originates the light beam received by the first and second focus-detecting sensors or received by the third and fourth focus-detecting sensors; and a second light detection sensor different from the first light detection sensor, wherein the first light detection sensor is disposed between the first and third focus-detecting sensors or between the second and fourth focus-detecting sensors, wherein the second light detection sensor is disposed between the first and third focus-detecting sensors or between the second and fourth focus-detecting sensors in a position different from where the first light detection sensor is disposed, and wherein at least one of the first and second light detection sensors is provided with an optical filter having a predetermined spectral sensitivity characteristic.