Motorized iris diaphragms have 1.5 Inch Series flanges to couple directly to Oriel Light Sources, and a 1/4-20 mounting hole. They are driven by a fine resolution stepping motor located in the iris assembly, which can be commanded via a PC or the included controller. RS-232 and IEEE-488 communications capability are included. Windows™ and LabVIEW™ libraries of drivers and VIs allow easy control. The optional hand controller allows control without a PC.