Products Home / Optomechanical Components / Irises / Apertures / Irises / Ring-Actuated, SM-Threaded Iris DiaphragmsRing-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
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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: | |
Justin Gerber
(posted 2021-10-14 15:38:41.55) Hello, can you please provide me the tolerance on the centration of the closed iris hole for these irises? Specifically SM1D12D? If the diaphragm is closed tightly the diaphragm "bows out" a little bit. Does the centration tolerance become worse in this circumstance? azandani
(posted 2021-10-27 03:03:29.0) Hello Justin, thank you for contacting Thorlabs. Based on the aperture, the tolerance of the closed iris hole will be around +/- 0.1 mm. In the circumstance where the iris "bows out", we unfortunately do not have a formal spec for how it would affect this tolerance spec. However, we do believe it will slightly affect it and we estimate that the tolerance would then be less than 0.2mm in this situation. Anton Ryzhov
(posted 2021-07-26 06:50:43.91) Dear Thorlabs team,
what is the axial distance between the leaves for Zero Aperture option? YLohia
(posted 2021-07-30 02:55:58.0) Thank you for contacting Thorlabs. Unfortunately, this is not a spec we can provide as the blades are in contact with each other most of the time (assuming you're referring to blade separation when you ask about axial distance). The blades are also hooked onto the spinning disk portion all at the same spot, so they overlap and touch each other at slightly varying angles, but are thin enough to slide over each other. The thickness of one blade is 0.05 mm (valid for all irises smaller than 50mm) and 0.07 mm (valid for irises equal and above 50mm in diameter). Chance Carter
(posted 2020-05-16 19:15:40.627) There has been a need for a long time now to develop a SM2D25D with a graduated iris (similar to the SM1D12C). I have grown weary of having to mark the SM2D25D with pencil marks. nreusch
(posted 2020-05-26 06:57:02.0) Thank you for your feedback. We will consider your suggestion and check whether we can add an SM2 graduated iris to our portfolio. 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. |
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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.
Zoom- SM1 (1.035"-40) Threaded on Both Sides
- Ring-Controlled, Ø12 mm Max Aperture
- Graduated and Zero-Aperture Versions Available
- Black Spring Steel Leaves
- 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 CP20D 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.
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SM1D12D Mechanical Diagram
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SM1D12C Mechanical Diagram
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SM1D12CZ Mechanical Diagram
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SM1D12C Shown Between Two SM1 Lens Tubes
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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 LCP50D Iris with a Ø2.0 mm to Ø50.0 mm aperture for 60 mm Cage Systems which is integrated into a cage plate for direct mounting to cage rods.
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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.
 SM-Threaded Ring Irises |