Macro Reverse Ring for Canon RF - Camera to Filter Thread Adapter for Canon RF – Fotodiox, Inc. USA
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H&Y Revoring variable step-up rings allow filters to fit multiple lens thread sizes: Digital Photography Review
Amazon.com : Astromania 0.5X Reducer for Photography and Observing - 1.25" Filter Thread (28.5x0.75MM) on Both Sides - Reduces The Focal Length for Visual and Photographic Use : Electronics
H&Y Revoring variable step-up rings allow filters to fit multiple lens thread sizes: Digital Photography Review
It All Starts with Thread Size and Rings!
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5/8-24 to 3/4-16, 13/16-16, 3/4NPT Automotive Threaded Oil Filter Adapter Black | eBay
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Baader Canon EOS DSLR T-Ring with 2" Filter Thread and Nosepiece # DSLR-T 2958550