Patent ID: 8197094

Claim:
A stage lighting fixture comprising: a casing ( 2 ); a light source ( 3 ) arranged at a closed end ( 10 ) of the casing ( 2 ) and adapted to emit a light beam substantially along an optical axis (B); an objective lens ( 4 ) located at an open end ( 11 ) of the casing ( 2 ); and beam size adjusting means ( 5 ) located between the light source ( 3 ) and the objective lens ( 4 ) to intercept the beam; the lighting fixture ( 1 ) being characterized in that the beam size adjusting means ( 5 ) comprise an optical element ( 15 ), in turn comprising a first region ( 22 ) with a first concave beam incidence surface ( 23 ) of first beam diffusion properties, and a second region ( 24 ) with a second concave beam incidence surface ( 25 ) of second beam diffusion properties.