Doesn't fit Nikon D3200, useless.,
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This review is from: Polaroid Auto Focus DG Macro Extension Tube Set (12mm, 20mm, 36mm) For Nikon Digital SLR Cameras (Electronics)
The title of this item implies it should work on all Nikon DSLR cameras, however no amount of fiddling could get these rings to properly click into place on my Nikon D3200, as a result of which the camera wouldn't function because it thought there was no lens in place. Basically it just didn't work with my camera. On it's way back and a refund requested.