An auto-focus apparatus, a focus adjusting method, an image capturing apparatus
and an image capturing method make it possible to perform accurate focus adjustment
on a subject for which the focus should be adjusted. The auto-focus apparatus emits
an irradiation wave from emitting means for irradiation to a subject while changing
an incident angle of the irradiation wave, detects an incident angle of a reflected
wave of the irradiation wave reflected by the subject, incident on light receiving
means positioned corresponding to the emitting means, determines based on the emitting
angle and the incident angle whether or not the subject is a subject for which
the focus is adjusted, and adjusts the focus on the subject when determining that
the subject is the subject for which the focus should be adjusted, thereby making
it possible to accurately adjust the focus on the subject for which the focus should
be adjusted.
