try_get_focal_length

Description:

[ Version ( since = "0.14.0" ) ]
public double try_get_focal_length () throws Error

See <ulink url="https://en.

wikipedia.org/wiki/Flange_focal_distance"></ulink> for more information.

Parameters:

this

An instance of Metadata

Returns:

The focal length as a gdouble, or -1.0 if tag is not present or invalid.