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Looking For a Custom Optical Solution? Enquire

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.


Max. aperture tol.
Min. aperture tol.
Outer diameter tol.
Thickness tol.
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.

29 Items

Name Maximum Aperture (mm) Minimum Aperture (mm) Outer Diameter (mm) Thickness (mm) Number of Leaves Pin Length (mm) Price Buy
GIQ0815 8 0.7 14.8 4.5 8 7
$43.65
GIQ9270 70 4.5 92 9.0 20 13.5
$213.23
GIQ75100 75 4.5 100 9 20 14.2
$232.13
GIQ5880 58 3 80 8 18 14.3
$159.99
GIQ5541 41 1.5 55 6.5 18 12.5
$72.14
GIQ5070 50 2.5 70 7.5 16 15
$140.11
GIQ5036 36 1.5 50 6 16 12.5
$65.05
GIQ4258 42 1.5 58 6.5 18 12.7
$82.98
GIQ4230 30 1.2 42 6 16 12.4
$58.52
GIQ2840 28 1.2 40 5.5 16 12.6
$52.96
GIQ2537 25 0.8 37 5.5 14 12.9
$49.07
GIQ2524 15 0.8 24 5 12 11.3
$42.26
GIQ225300 225 12 300 19 18 40.5
$576.85
GIQ2233 22 0.8 33 5.5 14 13.3
$47.68
GIQ208158 158 11 208 16 20 20.5
$535.15
GIQ2030 20 0.8 30 5.5 12 13.2
$46.57
GIQ1828 18 0.8 28 5 12 13.3
$45.18
GIQ180138 138 11.5 180 13 20 19.1
$472.60
GIQ150110 110 6 150 13 20 20.3
$375.30
GIQ140104 104 5 140 11 16 19.8
$355.42
GIQ13098 98 5 130 12 20 20
$339.44
GIQ1220 12 0.8 19.8 5 10 11.5
$39.20
GIQ12090 90 5 120 12 20 13.4
$302.33
GIQ120165 120 6 165 15 18 19.5
$389.20
GIQ11080 80.5 4.5 110 10 16 13
$252.56
GIQ0510 5 0.7 10 4.5 6 7.5
$90.49
GIF3754 37 0 54 7.5 16 12.6
$108.42
GIF2538 25 0 38 6.1 14 12.8
$81.04
GIF1221 12 0 21 6.2 10 11.8
$68.67

29 Items

1

Sprung Steel Leaves

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