16 mm Cage System Iris Diaphragm

  • 16 mm Cage System Compatible Iris
  • Continuously Variable Lever-Actuated Aperture
  • Button Head Lever Allows Actuation while Iris is Installed


For 16 mm Cage Systems

Application Idea

The SP8D Iris in a 16 mm Cage System. The low-profile button-head screw clears the fourth cage rod, allowing the iris to be actuated. 

Related Items

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Item # Cage System Standard Aperture Thickness
SP8D 16 mm Ø0.7 mm to Ø8.0 mm 0.23" (5.7 mm)


  • One-Piece Iris for 16 mm Cage Systems
  • Continuously Variable Iris Diaphragm: Ø0.7 mm to Ø8.0 mm Aperture
  • Ultra-Thin Cage Plate Design: 0.23" (5.7 mm) Thickness
  • Black-Anodized Aluminum Housing Limits Reflection

This lever-actuated, continuously variable, cage-system-compatible iris diaphragm is designed to provide smooth operation over many thousands of cycles. This iris is mounted in an ultra-thin, cage-system-compatible plate that engages three cage rods with locking screws that accept a 0.05" (1.3 mm) hex key. If replacement setscrews are needed, we offer SS4B013 brass setscrews, which use a 0.05" (1.3 mm) hex. The steel leaves within the iris are actuated by a button head lever that clears the fourth cage rod, as shown in the picture above, allowing for operation within the cage system. This iris has a maximum aperture of Ø8.0 mm and is permanently installed in the cage plate. 

In addition to the 16 mm cage system iris sold on this page, we also offer 30 mm and 60 mm cage system irises. Optic mounts and cage plates for 16 mm cage systems are also available here

For non-cage system use, we also offer post-mounted irises, SM-threaded lever-actuated irises, and unmounted irises with no mounting holes.

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SP8D Support Documentation
SP8D16 mm Cage System Iris Diaphragm (Ø0.7 - Ø8.0 mm)