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Ring-Actuated, SM-Threaded Iris Diaphragms![]()
SM2D25D SM2-Threaded Iris SM05D5D SM05-Threaded Iris SM1D12C SM1-Threaded, Application Idea SM1D12D Iris in a 30 mm Cage System ![]() Please Wait ![]() Click to Enlarge An XY Translation Mount can be used to optimize centration of an SM-threaded iris within a cage system.
Features
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.
![]() ![]() Click to Enlarge SM05D5D Mechanical Diagram
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. ![]()
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. ![]() Click to Enlarge SM1D12D Mechanical Diagram ![]() Click to Enlarge SM1D12C Mechanical Diagram ![]() Click to Enlarge SM1D12CZ Mechanical Diagram ![]() Click to Enlarge SM1D12C Shown Between Two SM1 Lens Tubes ![]() ![]() Click to Enlarge SM2D25D Mechanical Diagram
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. ![]() ![]() Click to Enlarge SM3D50D Mechanical Diagram
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. | |||||||||||||||||||||||||||||||||||||||||||||
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