i am simply another OV user and don’t typically work with these specific params in OV myself, so i’d defer to the mods/devs. i did come across another post from the mod where he establishes the relationship between the fx, fy, cx, cy and horizontal_aperture , vertical_aperture , horizontal_aperture_offset , and vertical_aperture_offset of the camera prim:
again, just passing what i find along since there doesn’t seem to be a clear documentation on this subject yet in the official OV doc (i don’t think anyway).