The XT Flash Extender Kit (Nikon SB-600) from Harbor Digital Design can add up to 2 f/stops of exposure at 100' (30.48 m) from the camera. Just mount the XT Extender directly to your Nikon SB-600, using the included mounting system (no straps or touch-tabs required) and you're ready for those wildlife, sports (indoor or outdoor), or any other shots at a distance previously too far for your flash to reach.