[ Version ( since = "0.14.0" ) ]
public double try_get_fnumber () throws Error
See <ulink url="https://en.
wikipedia.org/wiki/F-number"></ulink> for more information. If Exif.Photo.FNumber does not exist, it will fall back to calculating the FNumber from Exif.Photo.ApertureValue (if available);
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An instance of Metadata |
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The exposure Fnumber as a gdouble, or -1.0 if tag is not present or invalid. |