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Knight Optical’s iris diaphragms offer dynamic control of beam width and light throughput in optical systems. These sprung steel leaf iris diaphragms are available in fully closing and part closing types with open apertures up to 300mm. Each aperture is supplied in a high quality blackened brass body to absorp unwanted light and reduce the impact of reflection on the rest of the system.

Sprung steel leafed iris diaphragms are supplied with absorptive black leaves to minimise reflection.

These iris diaphragms are perfect for manual control of the input beam. For fixed aperture sizes we recommend Knight Optical's range of high precision pinhole and slit apertures that offer improved repeatability and accuracy.

Knight Optical also offers an extensive custom optic service thanks to our many years of experience in the industry. Our apertures can be manufactured to any size or shape to suit your application. More information is available by contacting our technical sales team directly.

Please note: Once GIQ208158 is no longer in stock, this product is obsolete.


Max. aperture tol.
Min. aperture tol. (may be smaller)
Outer diameter tol.
Thickness tol. 
(zero min aperture thk +/-0.15mm)
Lever length tol.

10-58mm
+0.05mm
+0.10mm
-0.05mm
+/-0.05mm

+/-0.50mm

70-110mm
+0.10mm
+0.50mm
-0.10mm
+/-0.10mm

+/-0.75mm

120-300mm
+0.20mm
+1.00mm
-0.20mm
+/-0.20mm

+/-1.00mm

Smaller and larger size iris diaphragms available.
Mounting options available.

Items 21-27 of 27

Name Maximum Aperture (mm) Minimum Aperture (mm) Outer Diameter (mm) Thickness (mm) Number of Leaves Pin Length (mm) Price Buy
GIQ11080 80.5 4.5 110 10 16 13
US$316.09
GIQ12090 90 5 120 12 20 13.4
US$378.64
GIQ13098 98 5 130 12 20 20
US$424.92
GIQ140104 104 5 140 11 16 19.8
US$445.08
GIQ150110 110 6 150 13 20 20.3
US$461.90
GIQ120165 120 6 165 15 18 19.5
US$500.68
GIQ180138 138 11.5 180 13 20 19.1
US$683.60
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Sprung Steel Leaves

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