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Micro 4/3rds T-ring
This is a 37mm Deep T2 Ring (Fits Olympus PEN & OM-D Series) (Fits Panasonic Lumix G Series) - 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.