I used them with an Olympus E M-1 mIII and an Olympus 60mm macro lens and a 40-150mm f/2.8 Pro lens and the tubes worked fine whether I am one, two or all three together. The autofocus still worked, although I usually used focus tracking at this magnification. I was just testing them, so I didn't. They appear to be well made. A nice addition to my toolbox and they seem to work better than other brands I've read about.
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