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Fits Canon EOS-M Mirrorless Cameras, Standard "T2" Length ~37mm. This “T-Ring” will couple your Mirrorless Camera to any T-Threaded Mount. The thread on this ring is Female 42mm (.75). Note that T-Rings for Mirrorless models are actually tubes, rather than rings.
Note: This T-Ring fits Canon M-series Mirrorless cameras only. It will not work with Canon EF or EF-S Cameras, or the new Canon R Series full-frame mirrorless cameras.