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It is made by metal with very high quality, but the price is much more acceptable.There is a wear rubber which have the funcion of anti-shock and anti-squeeze, the mirror will not be scratched.
It's 100% compatible with Canon:EF 80-200mm 2.8LEF 300mm F4L EF 400mm F5.6L lenses.
Ring Central diameter65MM
Tripod Mount Ring For Cano L7E EF 80-200mm 300 400 mm F2.8