CSB Series – Female to Female Lens Tubes
• Can serve as CCD camera extension tubes when used with various diameter adapters (requires C-mount adapter)
• Ideal for building complex optical systems by installing multiple optics in one tube using multiple retaining rings
• Compatible with Ø1" (25.4 mm) SM1 lens tube systems via adapters
• Directly supports Ø25 mm optical elements and is SM1 thread compatible
• Both ends feature ring-type design to mate with male–female extension tubes
The CSB series lens tubes are ideal for constructing compact optical cage systems. Each tube can hold one or more optical elements. With the use of retaining rings, the axial position of each optic can be precisely set and held in place. These stackable tubes are compatible with all Ø25 mm SM1-threaded components. Each tube comes with one retaining ring, and additional rings can be purchased for more complex builds.
CSA Series – Male to Female Lens Tubes
• Can be used as CCD camera extension tubes with adapters for various diameters
• Easy to build multi-component optical systems
• Supports mounting multiple optics in the same tube with multiple retaining rings
• Directly compatible with Ø1" (25.4 mm) lens tubes via various adapter connections
• Direct mounting of Ø25 mm optics supported; compatible with SM1 threads
• One end features a 3 mm raised C-mount threaded extension for added length
CSA lens tubes are ideal for constructing compact optical cage systems. These tubes can accommodate one or more optical elements. Using our retaining rings, the depth of each optic can be precisely set, enabling separation and secure positioning. These stackable tubes are compatible with all Ø25 mm threaded components. Each lens tube comes with one retaining ring, and additional rings can be purchased for complex system assembly.
CSA-V Series – Male to Female Ø1" Slotted Lens Tubes
• Easy manual access to optics without disassembly
• Dust-protective sliding cover can be rotated 360° open or closed
• Compatible with SM1 (1.035"-40) threaded components
The CSA-V series lens tubes are ideal for building compact, light-tight optical systems. Each tube features two side openings that allow easy, tool-free adjustment of mounted optics, even after assembly. This flexibility makes them suitable for complex optomechanical configurations.
| Model |
Outer Dimensions (Ø × L) |
Thread Type |
Internal Thread Depth |
Weight |
| CSA-40V |
Ø34.3 mm × 50.1 mm |
SM1 (1.035"-40) |
46.35 mm |
33.9 g |
| CSA-50V |
Ø34.3 mm × 60.1 mm |
SM1 (1.035"-40) |
56.35 mm |
39.4 g |
| CSA-60V |
Ø34.3 mm × 70.1 mm |
SM1 (1.035"-40) |
66.35 mm |
44.5 g |
CSK1 SM1 (1.035"-40) Stress-Free Retaining Ring
• Standard SM1 (1.035"-40) external thread;
• Designed to reduce stress when clamped;
• Compatible with SM1-threaded optical component mounts and lens tubes;
• Grooves on the retaining ring allow quick adjustment using a spanner wrench;
This design uses an O-ring made of nitrile rubber to reduce stress on the surface of the optical element and achieve light-tight sealing around the optic. Like our other standard retaining rings, the stress-free retaining ring also features two grooves compatible with spanner wrenches.
CSK3 SM1 Retaining Ring for Ø1" Lens Tubes and Mounts
• Standard retaining ring, SM1 (1.035"-40) external thread;
• Thickness: 2.0 mm;
• Clear aperture inner diameter: Ø22.9 mm;
• Compatible with SM1-threaded optical component mounts and lens tubes;
• Grooves on the retaining ring allow quick adjustment using a spanner wrench;
We offer various retaining rings for securing optical components into threaded mounts, lens tubes, and unmounted optic adapters. Two retaining rings are typically used to center the optic within the lens tube: one to hold the position, and the other to lock it in place.
