The Hasselblad Focusing Screen - HXD-31/40 Standard is a Spherical Acute-Matte D type focusing screen for HXD-31/40 medium format cameras. It is a bright screen with a 7.5mm diameter central marking for spot focus. It is a standard focusing screen in that it has no grid markings and is masked for the format used in 31/40 megapixel cameras.