A value that indicates if red-eye reduction was used when the image was captured.
- iOS 9.0+
- macOS 10.13+
- UIKit for Mac 13.0+Beta
When the value of this property is 0, no red-eye reduction was used; when the value is 1, red-eye reduction was used.
var aperture: NSNumber?
The size of the lens aperture at the time the image was captured, as a log-scale APEX value.
var fNumber: NSNumber?
The focal length of the lens divided by the diameter of the aperture when the image was captured.
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