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<http://webisa.webdatacommons.org/181795721>	<http://www.w3.org/ns/prov#value>	"As a result, it is possible to provide the optical apparatus which allows fast and accurate focusing operation.In addition, the determination of whether or not the subject is a moving body is performed on the basis of the defocus amount Df (the change amount .DELTA.Df) calculated in the focus detection unit 9 with the phase difference detection method." .