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Zero Aperture Series Iris Diaphragms

  • Provide Total Light Extinction When Closed
  • Aperture Sizes Up to 50mm
  • Iris Diaphragm Mounts Sold Separately

Designed and manufactured using the same high quality movements as our standard series Iris Diaphragms, the Zero Aperture series provides total light extinction. This type of control is often used in systems where the dark signal (background noise) must be measured for calibration. Two sets of leaves are used which are mounted on different tiers and are moved by one lever. For each iris, there are two additional relief leaves (not listed in table) that are not visible.

Note: Iris Diaphragm Mounts sold separately.

Technical Information

Outer Diameter A Maximum Aperture B Minimum Aperture C Thickness D Stock No.
102mm 75mm 0mm 9.1mm #64-506
21mm 12mm 6.2mm #53-906
29mm 12mm 6.1mm #62-649
38mm 25mm #53-907
54mm 37mm 7.5mm #53-908
72mm 50mm 9.1mm #53-909
37mm 12mm 6.2mm #62-653
54mm 25mm 6.1mm #62-654
67mm 37mm 7.5mm #62-655
88mm 50mm 9.1mm #62-656