title: Wide-field filter camera.
abstract: A rugged camera with a 32 degrees field has been constructed and used to detect faint nebulosity through narrow-band interference filters. The optimum bandwidth is determined. Also the merits of using a phosphor output image tube have been examined quantitatively, and a method of cooling the tube has been derived and investigated both experimentally and numerically.
authors.forename: P G
authors.initials: PG
authors.lastname: Johnson
authors.forename: A L
authors.initials: AL
authors.lastname: Kaye
authors.forename: J
authors.initials: J
authors.lastname: Meaburn