US$16.19
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So, other reviews kind of threw me off when I was looking at these. But for $16, I figured it was worth trying out. Are they cheap-feeling plastic on the inside? Yes. Does it matter that much? Not really. Are AF connections needed? Absolutely. Especially if you're shooting with STM lenses, the AF connections are a must if you want to be able to focus at all, manual or auto. At f/3 or wider, the depth of field is super thin and I recommend closing the aperture to at least f/5 to get more of your subject in focus and so viewers can get a better idea of what you took a photo of. By the way, one review talks about using all three together, you won't be using all three together; that's not how you use these. And yet another review here is obviously fake. These aren't lenses and you won't be taking portraits with these extension tubes on.