Mitutoyo to C-mount Camera 152.5mm Extension Tube | Edmund Optics
Thorlabs - CML40 C-Mount Extension Tube, 40 mm Long
Evertech 4pcs 5mm Camera C-Mount Lens Adapter Ring Extension Tube C to CS Mount Lens Black Aliminum Adapter for Most Types of CCTV Security Cameras - Yahoo Shopping
C-CS Mount CCTV Lens Adapter Ring Extension Tube 20mm 10mm 5mm 40mm 50mm 30mm 1mm