Some folks have also used a piece of aluminum foil on the back to enhance the halo effect. Important point in this is to have the same reflectivity across the entire pressure plate. Either way will eliminate the ghost images from the data port.I doubt you would want to put another back on the camera, wouldn't be cost effective. If you are going to dedicate the camera to doing infrared though you might look into a between the film rail filter so you can see to focus with a visually opaque filter.