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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		6.1mm	#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