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The Quantum QF51 is a 20' (6 m) extension cable that will extend the length of the QF21, QF50, QF52, QF53, or TTL adapters. Can be doubled up, for a maximum of five extension cables, to a total of 100' (30 m).
In the Box
Quantum Instruments Control Extension Cable - Male to Female - 20' - to Extend QF50, 52, 53 Cables, TTL Adapters or QF21