This is the oversized 48 mm t-ring for Canon DSLR cameras. Use it with our field flatteners that have the oversized 48 mm thread. The oversized T ring minimizes vignetting.
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As stated in the product information this T Ring worked as advertised.
Perfect fit for connecting my Canon DSLR to my Stellarvue SVX80T Field Flattener.
A great quality adapter that I use to connect my Canon Rebel XSi to the 48mm extension. FIt, finish, and price are excellent!