FireWire 800 to 400 15' 15 Foot Tether Tethered Photography Tools Cable For Phase One P20 P25 P30 P40 P45 P20+ P25+ P30+ P40+ P45+ P65+ Digital Back

Great cord and the modification is great... Until it isn't. Depending on how you hold the camera (phase 1 645DF+, P45 back)You get poked in the eye by the cord.The modification that nine volt makes is a tad too long, for me. Aside from that, the cord works well and maintains a flawless connection.