Patent ID: 8408755

Claim:
A stage lighting fixture comprising: a casing having a closed first end and an open second end; a light source housed inside the casing, close to the first end, to emit a light beam along an optical axis (A); an objective optical system located along the optical axis, at the second end of the casing, and having a focus position (X F ); and a circular-aperture diaphragm located along the optical axis (A), between the light source and the objective optical system, to intercept the beam; and characterized by an iris diaphragm located along the optical axis (A), between the light source and the objective optical system, and which can be set to the focus position (X F ), wherein the iris diaphragm comprises a plurality of substantially coplanar leaves connected at one end to a supporting frame, and free ends thereof do not overlap so that the free ends of pair of adjacent leaves are separated by spaced through which light can pass.