This guide helps buyers choose the right C-mount lens holders, adapters, and mounts for a stable, flexible imaging setup. Whether you’re assembling a DIY surveillance system, setting up a machine-vision project, or expanding a CCTV array, these options cover common hole pitches, materials, and mounting standards. The top picks below are best for professionals and hobbyists who need reliable mechanical fits, durable construction, and easy lens connections. Each product section explains who it’s best for, why it was chosen, and practical caveats to consider before purchase.
| Product | Best For | Key Feature |
|---|---|---|
| LIUZHENZHEN CS Metal Lens Base (20mm/22mm) | Projects needing flexible hole pitch | Durable metal base with 20/22mm compatibility |
| LIUZHENZHEN CS Metal Lens Base (20mm) | Compact setups with standard pitch | Stable mounting, easy C-mount connection |
| Arducam M12 Mount Lens Holder Set | Board cameras and modular builds | Eight styles for different heights and back focal lengths |
| ZCZQC C to CS Extension Tube | Bridge C and CS systems | Aluminum, precise threading, lightweight |
| HUIOP C to CS Mount Adapter (3 pcs) | Budget multi-pack for mixed lenses | Three metal adapters, easy conversion |
LIUZHENZHEN CS Metal Lens Base 22mm
The 22mm variant targets projects requiring a slightly wider mounting pitch. Best for established camera rigs or older modules that rely on 22mm spacing. The metal construction promises stable lens installation and long-term durability, making it suitable for professional surveillance or industrial imaging where vibration resistance matters. It is compatible with both 20mm and 22mm hole pitches via its CS/C-mount design, offering flexibility for various lenses.
Best for: technicians upgrading fixed, high-stability mounts where 22mm spacing is standard. Caution: ensure your lens or rail system supports 22mm spacing to avoid misalignment.
LIUZHENZHEN CS Metal Lens Base 20mm
This version prioritizes a compact footprint with a 20mm hole pitch. It’s ideal for smaller camera bodies and tight installations where space is at a premium, yet a solid metal base is still needed for reliable lens alignment. The C-mount design facilitates straightforward attachment to a broad range of lenses and cameras.
Best for: compact, space-constrained setups. Caution: verify physical clearance for your specific lens hood or adapter when space is tight.
Arducam M12 Mount Lens Holder Set
Designed for M12 lenses, this set accommodates varying back focal lengths with 18mm and 20mm hole spacings. It includes eight styles with different heights, made from plastic and metal, and clearly labeled for quick selection. This is especially useful for board cameras and modular imaging builds where frequent lens changes occur.
Best for: hobbyists and engineers building versatile boards or DIY systems. Caution: some configurations may require additional spacers or rails for perfect alignment.
ZCZQC Camera C-Mount to CS Extension Tube
Aluminum construction with a smooth, clear thread ensures reliable C to CS conversion. Its outer diameter of 30mm and inner diameter of 25mm suit many CCTV and industrial cameras, providing a slim profile for compact enclosures. Use this when you need a quick and sturdy adapter from C to CS without bulk.
Best for: surveillance and small-form factor projects requiring a simple C-to-CS bridge. Caution: verify thread compatibility with your existing lens mount hardware.
HUIOP C to CS Mount Adapter Set
This 3-piece metal set enables C-mount lenses to be used on CS-mount cameras. It’s a cost-efficient way to expand lens versatility across multiple platforms. The set is especially useful in labs or small studios where several lens options must be quickly deployed on CS cameras.
Best for: multi-lens testing and quick swaps. Caution: confirm whether your lenses require additional spacers for correct back focus.
Yoidesu 25mm C-Mount Rear Lens Holder
This rear lens holder is tailored for C-mount lenses with a 25mm diameter, suitable for storing or mounting rear elements when the lens is removed. It’s simple, compact, and useful in setups where space-saving storage or quick lens swaps are needed.
Best for: users needing a safe, compact lens storage/replacement accessory. Caution: not a primary mounting solution; use alongside a proper lens base or rail system.
25mm F1.4 CCTV Lens (C Mount)
The 25mm F1.4 CCTV lens combines a bright aperture with rugged aluminum housing for durability. Its manual adjustment capability lets you optimize exposure in variable lighting, while the wide 19.6-degree viewing angle supports a broad field of view for surveillance or monitoring tasks.
Best for: environments needing clear, bright imaging with simple manual control. Caution: ensure the lens focal length and back focal distance align with your imager’s sensor size.
Buying Guide
What mounting pitch do you need?
Measure your camera’s mounting hole pitch (distance between holes) and choose bases or adapters that match, typically 20mm or 22mm in these options. Mismatched pitches can cause misalignment and degraded image stability.
Should you pick C or CS mount first?
C-mount lenses are standard for many CCTV and machine-vision lenses. CS-mount lenses are designed for cameras with shorter back focal distance. If your camera is CS-mount, ensure adapters convert properly without extending focal distance excessively.
What about material and durability?
Metal bases and adapters generally offer better stability and vibration resistance than plastic. Choose aluminum for balance between strength and light weight, especially in field deployments or environments with temperature variations.
How many styles do you need?
Eight-style kits or multi-pack adapters are convenient for labs or workshops with multiple projects. If you only need a single setup, a dedicated 20mm or 22mm base may be the simplest choice.
Back focal length and compatibility
Back focal length varies by lens. Verify the lens’s back focal distance and ensure the adapter or holder allows proper focus without hitting the sensor or barrel. This avoids vignetting or focus shift in your imaging system.
Practical tips for assembly
- Dry-fit components before tightening to avoid cross-threading.
- Use thread lubricant where appropriate to improve longevity and ease of future swaps.
- Label your setups, especially in multi-lens racks, to speed future maintenance.
FAQ
- What is a C-mount lens holder used for? It secures C-mount lenses in place and can accommodate various hole pitches for flexible configurations.
- Can I convert C-mount to CS-mount with any adapter? Yes, but ensure the adapter provides correct back focus to prevent image misalignment.
- Are metal adapters better than plastic for surveillance projects? Generally yes, metal offers greater durability and stability in vibration-prone environments.
- Do I need multiple adapters for a single project? It depends on lens variety and how many cameras you operate; multi-pack sets reduce swap time.
- How do I prevent focus drift after installation? Tighten mounting screws evenly, verify back focal distances, and test with live subject focus to confirm stability.
- What should I consider when selecting a 25mm vs 20mm pitch? The pitch must match your camera rail or housing; mismatches can cause misalignment and mounting failure.