Compare Model Drawings, CAD & Specs Minimum Aperture Maximum Aperture Optical Axis Height Thread Type Availability Price
iris diaphragm model m-di47.50
5 mm 49 mm 33.5 mm M4
7 mm 73 mm 48.5 mm M4


Wide Range of Possible Aperture Sizes

M-DI47 Series Iris Diaphragms mount directly to Metric optical posts and pillars with the M4 threaded stud (rubber cover needs to be removed). They feature an easy-to-grip housing for aperture actuation and provide continuously variable apertures for a multitude of optical applications, such as beam alignment, light attenuation, or as baffles to block spurious reflections and scattered light. Two models are available with aperture size ranges 5.0 mm to 49 mm and 7.0 mm to 73 mm.

Continuously Adjustable Aperture With Ideal Shape

For smooth adjustment and an optimal shape for the aperture opening, each iris consists of an 18 of curved, overlapping, spring-steel leaves. These leaves intersect to provide a circular opening as they adjust continuously between two supporting rings with the adjustment of a pin handle attached to the inner ring.