I recently purchased an Opteka 6.5mm Fisheye (Samyang 8mm) and when I take images with it the Aperture is not added to the Exif data. All it says is f/0. Because of this, I cannot use the HDR feature of Autopano Giga. So my question is: how can I add the Aperture to the Exif data of my images? Is there a way to do this from the camera?