The distance from the reference surface to the focal point of the C-mount is 17.562 mm, and the focal length of the CS is 12.5 mm.
C-MOUNT 5mm Extension Tube Adapter C-CS Mount Adaptor Spacer Ring For CCTV Lens
HES Telescopic Extension Tube = Miele, Hoover Cleaner, Genuine.
Macro Extension Tube Set Exc+++
PB bayonet, EXTENSION TUBE Prakticar Praktica B mount bajonett bc ☆☆☆☆
