It makes sense when fast lenses

This ensures that the manual focus is facilitated and the depth of field can be better assessed. But songs is darker than the standard focusing screens for low light lenses the viewfinder image.

It was not until an aperture ratio of 1: 2.5 or 1: 2.8 is the use of the Ee-S advantageous, because from this aperture ratio to collect the standard discs anyway no additional light more (the viewfinder image is not brighter), while the Ee-S still light from these large angles of incidence fields.

The Einstellmattscheibe is supplied in a plastic box incl. Special tweezers. The exchange of Einstellmattscheibe is quite simple with a steady hand, fortunately, thanks to the included tweezers: A flap on the camera is open, it takes the old ground glass, positions the new, still not quite close the door and you're done ... no: Because adjusting the exposure of the camera nor the individual function (C.Fn-00) has the new adjustment shims are communicated.

Who nutz only the autofocus and hardly focused manually this disc is not needed.