For security technicians, industrial camera operators, and photography professionals who require mount conversion for specialized Surveillances or machine setups Aluminum construction with a precise 30 mm outer diameter extends C mount compatibility while maintaining optical alignment. This extension tube converts between C lens mounts without compromising alignment or image quality. Spacer rings for flawless lens integration across security and industrial applications. Standardized C thread specifications simplify setup and maintenance. 5 mm and 10 mm aluminum adapter rings enable seamless connection of a C mount lens to CCTV security cameras, ensuring precise compatibility for industrial and surveillance imaging systems. Key specifications Material: aluminum Outer diameter: 30 mm Mounting: C mount standard, with 5 mm and 10 mm spacers/adapters Installation: tool Use scenarios Security camera upgrades: convert existing C mount lenses to CCTV cameras on a surveillance system, with spacing adjusted to achieve correct focus and field of view. Industrial machine vision: configure C mount lenses on factory floor cameras, using spacers to maintain precise back focus and alignment for consistent imaging. Field testing and prototyping: quickly swap and space C mount lenses for experimental setups on security or industrial imaging rigs without tools.