[ Version ( since = "0.16.0" ) ]
public double get_fnumber () throws Error
See https://en.wikipedia.org/wiki/F-number for more information.
If Exif.Photo.FNumber does not exist, it will fall back to calculating the FNumber from Exif.Photo.ApertureValue (if available)
| this |
An instance of [class@GExiv2.Metadata] |
|
The exposure Fnumber as a gdouble, or -1.0 if tag is not present or invalid. |