The Canon 12-Pin to 12-Pin Interface Extension Cable is essential for extending servo control from ENG broadcast lenses and select Canon camcorders. This extension cable allows for camera controlled servo with broadcast lenses like the Canon Cine Servo 25-250mm T2.9 or 17-120mm T2.9-3.9 with the Canon EOS C300 MK III or C500 MK II when paired with the EU-V2. It is also compatible with external controllers like the Canon ZSD-300D or FPD-400D. This version measures 15.7" in length.