FOCUSING METHOD OF PHOTOGRAPHING APPARATUS AND PHOTOGRAPHING APPARATUS ADOPTING THE FOCUSING METHOD

摘要

A focusing method includes operations (a) through (d). In (a), a maximum focus value generated during a searching is set as a first maximum focus value. In (b), the focus lens moves to a first position that is the position of the first maximum focus value. In (c), a focus value generated when the focus lens moves to the first position is set as a second maximum focus value. In (d), if it is determined that a difference value between the first maximum focus value and the second maximum focus value is greater than a first set allowance value, a position of a focus value, whose difference value from the first maximum focus value is less than a second set allowance value, is searched for within a second range that has the first position as its center and is narrower than the first range.

主权项

1. A focusing method for focusing a photographing apparatus comprising a focus lens and a photoelectric conversion unit, the focusing method comprising:
(a) searching for a position of a maximum focus value by moving the focus lens within a first range, and setting the maximum focus value generated during the searching as a first maximum focus value; (b) moving the focus lens to a first position that is a position of the first maximum focus value; (c) setting a focus value generated when the focus lens moves to the first position as a second maximum focus value; and (d) determining whether a difference value between the first maximum focus value and the second maximum focus value is greater than a first set allowance value, and if it is determined that the difference value is greater than the first set allowance value, searching for a position of a focus value of which a difference value from the first maximum focus value is less than a second set allowance value, within a second range that has the first position as its center and is narrower than the first range.