... optional Mount Adapters helping to ensure you ... 54 mm Diameter Mount and ... 20 mm Flange Focal Distance ... mounted just 20 mm from the image ... ... 28–70 mm F2 L ... ... 28–70 mm F2 L ... ... 28–70 mm . 20 mm ... Take full advantage of the EOS system by using any EF/EF-S lens with the EOS R camera by way of three optional mount adapters, including one featuring a customizable control ring and another allowing you to drop in a circular polarizing or variable ND filter .
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