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I have been very happy with the OpTech series of straps that have quick release buckles near the camera. They are strong and secure, and I have been using them with Canon 1D series bodies and big zooms like the 70-200 f2.8 and 100-400. I also use the same strap system on lens cases and binoculars, and occasionally on the lens lugs on my 300 f2.8 L IS. For the big lens use, I only occasionally need to use a strap on it, but when I do, I trust the OpTech system completely.