(from Datasheet, June 1967)
These compact spotlights, with four built-in but externally operated shutters, project a clear cut even beam of any profile determined by the shutters or a cut-out mask in the gate runners. Four masks of different, but fixed apertures are provided; optional beam-shaping accessories are an adjustable straight-edge mask or an iris diaphragm.

Different lens combinations are available so that the most efficient use can be made of the light collected at the gate by the front annular and rear ellipsoidal reflectors. The Fresnel lens model, Patt 23F, provides a diffused edge to the beam.

These models are recommended for applications where precise control of beam shape and spread is required in display, exhibition and feature lighting. For stage and studio lighting, where more frequent change of beam shape is necessary, the models with externally operated beam-shaping shutters, will be found more convenient.