20110080735 | STAGE LIGHTING FIXTURE - A stage lighting fixture having a casing extending along a longitudinal axis; a light source housed in a closed end of the casing to emit a light beam substantially along an optical axis; an objective lens located at an open end of the casing; and beam size adjusting means located between the light source and the objective lens to intercept the beam. The beam size adjusting means have an optical element, in turn having a first region with a first concave beam incidence surface of first beam diffusion properties, and a second region with a second concave beam incidence surface of second beam diffusion properties. | 04-07-2011 |