Small exceptionally smooth operation from maximum to minimum aperture IRIS diaphragm type NT30-263 made by Edmund Optics. The outer diameter of this IRIS is 19.8mm, maximum aperture is 12mm, minimum aperture is .8mm and thickness is 5mm. This IRIS features 10 leaves and has a 3mm x 12mm pin to operate it. Precision made IRIS diaphragms can control focal length/effective diameter, field stop diameter, and energy throughput. Brand new in manufacturer envelope. These sell for about $38.00 elsewhere.
G16597