Step-Down Rings by Midwest Optical Systems (MidOpt)⁣⁣

+ 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)⁣⁣
+ Available sizes: SD27-25.5 - SD82-77⁣⁣
+ Commonly referred to as a thread adapter 


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