
oook , I did a new scene from scratch and this time the Mental Ray and Octane passes seem to match... pfiuuu. Don't know what happened but Fov is ok now

I still have problems with the MotionBlur Pass but I think it's a MentalRay issue.
Nevertheless, I've been working on a little camera rig with automated DoF Focus Planes Hud (Near focus in blue, Far focus in red).
They react interactively to the focal length , aperture (in f-stop), Focus point (yellow null) and aspect ratio.