Everyone needs autofocus extension tubes (http://sdp.io/tube): wildlife photographers, wedding photographers, landscape photographers, commercial photographers, etc. They're incredibly inexpensive and easy to use, but they make a HUGE difference in your photos by letting you get MUCH closer than you could otherwise, producing a BIGGER picture. Extension tubes can be a little tricky to use. Once you attach them, you give up infinity focus. If you use too much extension, you won't be able to focus

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