Whoa - just briefly read the linked article - seems Field of View is a
distance,
not an angle!
The FOV parameter in C3D goes from 0 to 180 - and if your render aspect ratio is 1:1, and you look from top or side, the number corresponds to an angle displayed as part of the camera object.
I checked Blender too - it's camera has an FOV parameter, but in the help document they call it the 'Field of View Angle'.
Anyway, if I export to Collada from Blender, and import in another application (HDR Light Studio - which I am evaluating) the FOV angle and Camera position are correctly recognized as expected... The reason this is important is that HDR Light Studio doesn't let you change camera parameters - in that app you are doing your lighting based on an exact position of the camera - which is necessary for placing reflections.
So I think this is a problem with C3D's Collada import and export. Export seems to lose the angle in question, while Import rotates the camera and just has default FOV angle of 40.
Hopefully it can be addressed.
@Swizl - thanks for the info.
--shift studio.