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Ring-Actuated, SM-Threaded Iris Diaphragms


  • Compatible with Our Lens Tubes
  • Ring-Actuated Design Ideal for Low-Profile Applications
  • Graduated and Zero Aperture Options

SM2D25D

SM2-Threaded Iris

SM05D5D

SM05-Threaded Iris

SM1D12C

SM1-Threaded,
Graduated Iris

Application Idea

SM1D12D Iris in a 30 mm Cage System

Related Items


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Click to Enlarge
An XY Translation Mount can be used to optimize centration of an SM-threaded iris within a cage system.
Iris Selection Guide
Post-Mountable Irises
Unmounted Irises
SM-Threaded, Lever-Actuated Irises
SM-Threaded, Ring-Actuated Irises
Cage System Irises

Features

  • SM05-, SM1-, SM2-, and SM3-Threaded Models
  • Ring-Actuated Design Eliminates Actuating Lever, Significantly Reducing Clearance Requirements
  • Versions with a Laser-Engraved Scale to Indicate Aperture Size
  • Zero Aperture Option Blocks All Incoming Light in Closed Position
  • Lockable via Setscrew on the Side of the Housing

Our ring-actuated irises are perfect for tight spaces where the lever on our Standard Lever-Actuated Irises or Threaded Lever-Actuated Irises does not easily fit. Ring-actuated irises are especially beneficial within our cage assemblies, preventing interference between a lever actuator and the surrounding cage rods, as shown in the image to the right. The ring actuator provides an intuitive, smooth feel; the aperture size can be locked via a setscrew, see below for details. All of the irises on this page contain black spring steel leaves.

Item # SM05D5D SM1D12D SM1D12C SM1D12CZ SM2D25D SM3D50D
Type Ring Actuated Ring Actuated Ring Actuated,
Graduated
Ring Actuated,
Graduated,
Zero Aperture
Ring Actuated Ring Actuated
Thread Standard SM05 (0.535"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM2 (2.035"-40) SM3 (3.035"-40)
Aperture (Min) Ø0.7 mm (Ø0.03") Ø0.8 mm (Ø0.03") Ø1 mm (Ø0.04") Zero Ø1 mm (Ø0.04") Ø2 mm (Ø0.08")
Aperture (Max) Ø5 mm (Ø0.20") Ø12 mm (Ø0.47") Ø12 mm (Ø0.47") Ø12 mm (Ø0.47") Ø25 mm (Ø0.98") Ø50 mm (Ø1.97")

Posted Comments:
anil  (posted 2018-08-31 04:29:48.37)
I want to purchase this item kindly provide the quotation.
wskopalik  (posted 2018-09-06 05:19:11.0)
This is a response from Wolfgang at Thorlabs. Thank you very much for your inquiry. I will contact you directly to provide a quotation.
wayne.rapp  (posted 2018-03-08 13:27:51.94)
Can you tell me an accuracy number that defines the location (concentricity) of the aperture vs. the mounting ring?
mvonsivers  (posted 2018-03-09 06:55:50.0)
This is a response from Moritz at Thorlabs. Thank you for your inquiry. I will contact you directly to provide information on tolerances of the iris diaphragm dimensions.
franciscojavier.avila  (posted 2018-01-08 08:24:46.4)
Hello: I am coupling this variable iris in a rotating motor and I wanted to know the exact correspondence between angular displacement of the wheel and the diameter of the aperture. Thanks Francisco.
swick  (posted 2018-01-09 04:06:17.0)
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. This parameter is not specified but we can provide typical data. I will contact you directly with further information.
bdada  (posted 2012-06-05 19:04:00.0)
Response from Buki at Thorlabs to kaccie: Thank you for participating in our feedback forum. I am checking with our production team to see if this modification will negatively impact the performance of the iris. Please note that any modifications will void the warranty on the item.I have contacted you directly to continue this conversation.
kaccie  (posted 2012-06-04 06:20:38.0)
Regarding the SM1D12C. Would anything strange happen (in terms of proper movement of the blades) if I cut off the back 3 mm of the unit? I ask because the unit is just a bit too thick for my application, and I really don't need the SM1 threads sticking out in the back. Thanks Kaccie
jjurado  (posted 2011-06-16 11:13:00.0)
Response from Javier at Thorlabs to k1w05: Thank you very much for contacting us. The distance from aperture plane to the outer face (with the external thread) is 4.14 mm. Keep in mind that your measured value of 4.54 mm is still within the mechanical tolerance range (+/-0.50 mm) of this dimension. Please contact us at techsupport@thorlabs.com if you have any further questions.
k1w05  (posted 2011-06-12 09:33:47.0)
I have a iris of SM1D12C. I want to design a structure to mount this iris, can you tell me the accurate distance between the apeture plane and one outer face of SM1D12C. The number I measured is about 4.54mm. I hope your accurate number.

SM05-Threaded, Ring-Actuated Iris Diaphragm

SM05D5D Diagram
Click to Enlarge

SM05D5D Mechanical Diagram
  • SM05 (0.535"-40) Threaded on Both Sides
  • Ring-Controlled, Ø0.7 mm - Ø5 mm Aperture
  • Black Spring Steel Leaves
  • Locking Setscrew with 0.035" (0.9 mm) Hex

The SM05D5D ring-actuated iris diaphragm is SM05-threaded for compatibility with our Ø1/2" lens tubes, 16 mm cage systems, and other SM05-threaded accessories. One side of the iris is externally threaded, while the other is internally threaded. This allows for easy insertion into existing systems using standard lens tube components. The design of this iris is well suited for integration into a cage system with minimal alignment. To precisely optimize the centration of the iris hole to the optical axis of the cage system, Thorlabs recommends mounting the iris on an XY Translation Mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM05D5D Support Documentation
SM05D5DCustomer Inspired! SM05 Ring-Actuated Iris Diaphragm (Ø0.7 - Ø5 mm)
$86.30
Today

SM1-Threaded, Ring-Actuated Iris Diaphragms

  • SM1 (1.035"-40) Threaded on Both Sides
  • Ring-Controlled, Ø12 mm Max Aperture
  • Graduated and Zero-Aperture Versions Available
  • Black Spring Steel and Stainless Steel Leaf Versions Available
  • Locking Setscrew with 0.05" (1.3 mm) Hex

These ring-actuated iris diaphragms are SM1-threaded for compatibility with our Ø1" lens tubes, 30 mm cage systems, and other SM1-threaded accessories. One side of the iris is externally threaded, while the other is internally threaded. This allows for easy insertion into existing systems using standard lens tube components. The design of these irises is well suited for integration into a cage system with minimal alignment. To precisely optimize the centration of the iris hole to the optical axis of the cage system, Thorlabs recommends mounting the iris on an XY Translation Mount.

The SM1D12D is our standard SM1-threaded, ring-actuated iris with a Ø12 mm maximum aperture. Thorlabs also offers the CP20S Iris for 30 mm Cage Systems which is integrated into a cage plate for direct mounting to cage rods.

The SM1D12C Graduated Iris offers an additional laser-engraved scale, which indicates the actual diameter of the iris in millimeters to within ±0.5 mm. In applications where the iris cannot be easily viewed, such as the lens tube configuration shown to the lower right, this engraved scale greatly simplifies the process of optimizing the iris diameter.

The SM1D12CZ Zero-Aperture Graduated Iris provides the added benefit of being able to close completely. Our zero-aperture design achieves a completely closed aperture by utilizing two sets of steel leaves mounted in two adjacent planes. When the ring is in the closed position, the iris aperture is completely closed (zero aperture), unlike a standard iris, which has a non-zero diameter aperture when in the minimum position. Please note that as the aperture gets smaller, it also becomes slightly elliptical due to the design of the iris.

SM1D12D Diagram
Click to Enlarge

SM1D12D Mechanical Diagram
SM1D12C Diagram
Click to Enlarge

SM1D12C Mechanical Diagram
SM1D12CZ Diagram
Click to Enlarge

SM1D12CZ Mechanical Diagram
SM1D12C Application
Click to Enlarge

SM1D12C Shown Between Two SM1 Lens Tubes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1D12D Support Documentation
SM1D12DSM1 Ring-Actuated Iris Diaphragm (Ø0.8 - Ø12 mm)
$71.15
Today
SM1D12C Support Documentation
SM1D12CSM1 Graduated Ring-Actuated Iris Diaphragm (Ø1 - Ø12 mm)
$109.29
Today
SM1D12CZ Support Documentation
SM1D12CZSM1 Graduated Ring-Actuated Zero Aperture Iris Diaphragm, Ø12 mm Max Aperture
$124.44
Today

SM2-Threaded, Ring-Actuated Iris Diaphragm

SM2D25D Diagram
Click to Enlarge

SM2D25D Mechanical Diagram
  • SM2 (2.035"-40) Threaded on Both Sides
  • Ring-Controlled, Ø1 mm - Ø25 mm Aperture
  • Black Spring Steel Leaves
  • Locking Setscrew with 0.05" (1.3 mm) Hex

The SM2D25D ring-actuated iris diaphragm is SM2-threaded for compatibility with our Ø2" lens tubes, 60 mm cage systems, and other SM2-threaded accessories. One side of the iris is externally threaded, while the other is internally threaded. This allows for easy insertion into existing systems using standard lens tube components. The design of this iris is well suited for integration into a cage system with minimal alignment. To precisely optimize the centration of the iris hole to the optical axis of the cage system, Thorlabs recommends mounting the iris on an XY Translation Mount.

Thorlabs also offers the LCP50S Iris for 60 mm Cage Systems which is integrated into a cage plate for direct mounting to cage rods.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM2D25D Support Documentation
SM2D25DSM2 Ring-Actuated Iris Diaphragm (Ø1 - Ø25 mm)
$89.55
Today

SM3-Threaded, Ring-Actuated Iris Diaphragm

SM3D50D Diagram
Click to Enlarge

SM3D50D Mechanical Diagram
  • SM3 (3.035"-40) Threaded on Both Sides
  • Ring-Controlled, Ø2 mm - Ø50 mm Aperture
  • Black Spring Steel Leaves
  • Locking Setscrew with 0.05" (1.3 mm) Hex

The SM3D50D ring-actuated iris diaphragm is SM3-threaded for compatibility with our Ø3" lens tubes and other SM3-threaded accessories. One side of the iris is externally threaded, while the other is internally threaded. This allows for easy insertion into existing systems using standard lens tube components. The design of this iris is well suited for integration into a cage system with minimal alignment.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM3D50D Support Documentation
SM3D50DNEW!SM3 Ring-Actuated Iris Diaphragm (Ø2 - Ø50 mm)
$130.00
Today
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