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This review is from: NEEWER62-77mm 62MM to 77MM Step Up Ring Filter Adapter Ring (Camera)
and banish vignetting on wide angles, buy all your filters at 77mm, (or the largest lens filter thread you have). Use the step up to fit to all your lenses. Its ideal for fitting a polariser on a wide-angle as most are a little deeper than a UV so can create vignetting.