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| p.2 #1 · Ideas about carrying 2 cameras at one time... |
I was having this issue every few weddings. I think what was happening, it when I was shooting landscape, and then moving the camera to portrait, my hands where were inadvertently pushing down the lens release button during the twist and it was just enough to loosen the lens.
In the past few weddings I haven't had this issue since I put the battery grip on. Personally, I'm not a fan of grips, but it really does balance out the 5DIII with a 70-200.