I ordered a Sigma 100-400mm DG DN OS lens and added it as an alternative to the very expensive 1/3 cost Sigma collar. No regret. Well constructed, durable to the touch and a perfect fit. It didn't come with instructions, but it was easy enough to figure out. Comes with a hex wrench to swap out the base. The only minor gripe is that the white alignment mark on the collar doesn't quite line up with the height of the camera when you align it with the alignment mark on the lens, but that doesn't really matter to me. Highly recommended.
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