FBX cameras

[easty]

Hi,
The FBX cameras do not match the real world input camera. if I was shooting with a 6D the aperture should be 35.8  and not 41.4852 in the imported FBX camera from the photoscan calculation. Also the focal length on the real world camera was 40mm , photo scan spits out a 41.4852 focal even when reading the focal value from the exif data ?
The maths to make the FBX camera should be

2*atan( aperture )  / 2* focal )
 
So wouldn't it be great if you could input the aperture and focal length into photoscan so it spits out the correct FBX cameras

Rob