Very cheap, 10 time cheaper than extesion tube with contacts. Lens (50mm 1:1.8 cannon) can be reversed for "Normal" photo without removing the ring. Look well done, no issue on both end, attachment feels tight but not hard to screew on the lens and on the other end, feels like attaching the original lens. I mesured about 3mm (1/8 in) DoF, ... Read more
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