Lens Plate for EF 400 f/4.0 DO IS USM & EF 300 f/2.8 IS USM (NOT THE OLDER NON-IS) At 4" the CP 42 is long enough to cover the balance point even with lighter cameras. It has a double cut dovetail to accommodate flash arms using the ARCA style mount. Securely mounts to the lens with our superior internal rib system . ARCA compatible like all 4th Generation Designs products. Wrench, mounting, and limit screws provided. Weight: 1.6 ounces (45 grams)

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