The actual aperture value of lens when the image was taken. Unit is APEX. To convert this value to ordinary F-number (F-stop), calculate this value's power of root 2 (=1.4142). For example, if the ApertureValue is '5', F-number is 1.41425 = F5.6.

public double EXIF_ApertureValue { get; set; }

Public Property EXIF_ApertureValue As Double
	Get
	Set

public:
property double EXIF_ApertureValue {
	double get ();
	void set (double value);
}