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 70-200mm f/2.8 L IS USM
-Canon EF 70-200mm f/2.8 L USM
Features:
-Minimum inner ring diameter: 78mm
-Ring thickness: 3mm
-The UNC (Unified National Coarse Thread) is 1/4
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