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Step-Down Rings use smaller diameter filters on lenses with larger diameter filter threads. The diameter of the filter or lighting to which step-down rings are coupled will be much smaller than the diameter of the lens (often resulting in vignetting) Step-Down Part Numbers SD27-25.5, SD30.5-27, SD34-30.5, SD46-40.5,SD...
Step-Up Rings are used for larger diameter filters on lenses with smaller diameter filter threads. These rings are often mandatory for shorter focal length lenses in order to prevent vignetting.