The Chevron type microchannel plate assembly is mounted on a CF 6″ O.D. flange that gives comfortable access to the channelplates. The fiberoptic screen collects the light directly from the phosphorous layer and brings it to the atmospheric side where it is collected using a large aperture objective. The many artifacts due to reflection and total reflection inside a standard screen design are completely eliminated. The picture shows a view of the detector assembly as mounted to the STAIB PEEM-350.