You need to enable Projection Plane and specify the Film Aperture. You may need to convert mms to inches because SI only uses inches for Film Aperture.
You could also create a custom property like this: http://www.softimageblog.com/archives/65 This addon is a little old so you may need to modify it to support newer standards. It works even with the default film aperture locked and automatically converts the orientation to the vertical/horizontal equivalent. SI should have something like that by default. M.Yara
