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SM2-Threaded Irises

  • Lever or Ring Actuated
  • Ø25 mm (Ø0.98") Maximum Aperture
  • SM2 Threading for Lens Tube Compatibility


Lever-Actuated Iris


Ring-Actuated Iris

Application Idea

SM2D25D Iris Shown Threaded into
SM2L30 Lens Tube and Mounted in
SM2RC Slip Ring on Ø1/2" Post

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SM-Threaded Irises


  • Lever or Ring Aperture Control
  • SM2 (2.035"-40) Internally and Externally Threaded
  • Minimum Aperture: Ø1 mm (Ø0.04")
  • Maximum Aperture: Ø25 mm (Ø0.98")

Our SM2 (2.035"-40) threaded irises are compatible with our Ø2" lens tubes and other SM2-threaded components. Each iris has internal SM threading on one side and external SM threading on the other side. The individual black spring steel leaves pivot within the outer ring of the iris and are designed for long-lasting performance over several thousand cycles.

The SM2D25D ring-actuated iris is designed for integration into a 60 mm cage assembly, where the movement of a lever actuated iris would be hampered by the cage rods. This iris also features a locking setscrew with a 0.05" (1.3 mm) hex for locking the ring during installation or removal. Thorlabs also offers the LCP50S Iris for 60 mm Cage Systems which is integrated into a cage plate for direct mounting to cage rods.

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Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM2D25 Support Documentation
SM2D25SM2 Lever-Actuated Iris Diaphragm (Ø1 - Ø25 mm)
SM2D25D Support Documentation
SM2D25DSM2 Ring-Actuated Iris Diaphragm (Ø1 - Ø25 mm)
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