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Lever-Actuated, SM-Threaded Iris Diaphragms![]()
SM1D25 Internally SM2D25 SM2-Threaded Iris SM1D12SS SM1-Threaded SM1D12 SM1-Threaded Iris SM1L03 Lens Tube SM1RC Lens Tube Application Idea ![]() Please Wait
Features
Thorlabs offers lever-activated irises with compatible lens tube threading for use with our lens tube systems, SM-threaded mounts, and cage systems. In addition, Thorlabs offers a line of Post-Mountable Irises, SM-Threaded Ring-Actuated Irises, Unmounted Irises, and Cage System Irises as well as mounted pinholes and slits.
Thorlabs' Threading SpecificationsThorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.
![]() ![]() Click to Enlarge SM05D5 Mechanical Diagram
The SM05D5 lever-actuated iris diaphragm is SM05-threaded for compatibility with our Ø1/2" lens tubes and other SM05-threaded accessories. The housing features an engraved arrow which indicates the direction the lever must be moved to close the aperture. 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 setscrews on the housing retain the internal aperture mechanism within the housing and should not be adjusted. ![]()
These lever-actuated iris diaphragms are SM1-threaded for compatibility with our Ø1" lens tubes and other SM1-threaded accessories. The housing of each iris features an engraved arrow which indicates the direction the lever must be moved to close the aperture. Our SM1D12 and SM1D25 iris diaphragms offer maximum apertures up to Ø12 mm and Ø25 mm, respectively. The SM1D12 iris has internal SM1 threading on one side and external SM1 threading on the other side (see drawing to the right). Our SM1D25 iris has internal SM1 (1.035"-40) threading on both sides of the housing (see drawing to the right) as well as a full Ø25 mm aperture. The SM1D12SS iris features stainless steel leaves for use in higher power applications than traditional spring steel irises. The aperture can be continuously varied from the maximum aperture diameter of 11.9 mm to a minimum aperture diameter of 1.0 mm. The lever-activated diaphragm is designed to provide smooth operation for several thousand cycles. An engraved arrow indicates the position the lever must be in to close the iris. We use a magnetic stainless steel in this iris. Due to its hardness, it offers a longer lifetime than typical non-magnetic stainless steel. This iris also has internal SM1 (1.035"-40) threading on one side and external SM1 threading on the other. The SM1D12SZ zero-aperture iris diaphragm is continuously variable from the maximum aperture diameter of 11.9 mm to completely closed (zero aperture). Our zero-aperture design achieves a completely closed aperture by utilizing two sets of steel leaves mounted in two adjacent planes. The iris leaves are made from black spring steel and the lever-activated diaphragm is designed to provide smooth operation for several thousand cycles. These irises feature an engraved arrow on the housing which indicates the direction the lever must be moved to close the aperture. As the aperture gets smaller, it also becomes slightly elliptical due to the design of the iris. This housing has internal SM1 (1.035"-40) threading on one side and external SM1 threading on the other. The setscrews on the housings of these irises retain the internal aperture mechanism within the housing and should not be adjusted. ![]() Click to Enlarge SM1D12 Mechanical Diagram ![]() Click to Enlarge SM1D25 Mechanical Diagram ![]() Click to Enlarge SM1D12SS Mechanical Diagram ![]() Click to Enlarge SM1D12SZ Mechanical Diagram ![]() ![]() Click to Enlarge SM2D25 Mechanical Diagram
The SM2D25 lever-actuated iris diaphragm is SM2-threaded for compatibility with our Ø2" lens tubes and other SM2-threaded accessories. The housing features an engraved arrow which indicates the direction the lever must be moved to close the aperture. 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 setscrews on the housing retain the internal aperture mechanism within the housing and should not be adjusted. ![]() ![]() Click to Enlarge SM3D50 Mechanical Diagram
The SM3D50 lever-actuated iris diaphragm is SM05-threaded for compatibility with our Ø3" lens tubes and other SM3-threaded accessories. The housing features an engraved arrow which indicates the direction the lever must be moved to close the aperture. 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 setscrews on the housing retain the internal aperture mechanism within the housing and should not be adjusted. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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