Tinkering with CCTV or machine vision lenses? This little 5mm extension tube adapter lets you fine-tune the distance between your C-mount lens and camera sensor. It's basically a spacer ring that converts or extends C-mount to C/CS compatibility.

Brand new and unbranded, but machined to precise standards. Great for adjusting focus, back focus, or fitting lenses to slightly different camera bodies. If you're into security cameras, microscopy, or industrial imaging, this cheap part can solve a lot of mounting headaches. Just screw it in between your lens and camera. No electronics, no fuss — pure mechanical adjustment. Keep one in your toolkit for those 'almost fits' moments!