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Post-Mountable Iris Diaphragms
Pack of 5 with Threaded Stud
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Shown is a comparison between minimum aperture sizes on our standard, stainless steel, and zero-aperture irises.
These lever-actuated, continuously variable iris diaphragms are designed to provide smooth operation over many thousands of cycles. The individual steel leaves pivot within a black-anodized aluminum housing.
With the exception of the Mini-Series Mounted Iris Diaphragm (ID5MS, ID5MS/M), which is mounted on a Ø6 mm post for compatibility with our Mini-Series line, and our five-pack standard iris diaphragms, all iris diaphragms listed below are mounted on a removable 3" (75 mm) long Ø1/2" post. Irises without a post are available as a special by contacting Tech Support. Irises with item # prefix IDA are sold in packs of five with a bottom-located 8-32 (M4) setscrew but no mounting post.
In addition to the post-mountable irises sold on this page, Thorlabs also offers SM-threaded Lever-Actuated Irises and
When the lever is in the closed position, the iris aperture is completely closed with a zero diameter aperture, unlike a single layer iris, which has a non-zero diameter aperture when the lever is in the closed position. Our zero-aperture design achieves a completely closed aperture by utilizing two sets of steel leaves mounted in two adjacent planes. Please note that as the aperture gets smaller, it also becomes slightly elliptical due to the design of the iris.
Please note that these irises are fabricated from magnetic stainless steel. Due to its hardness, magnetic stainless steel offers a longer lifetime than typical nonmagnetic stainless steel.