1. The original structure and design of F (WIII) are adopted, and the function of quick release plate is added at the bottom; the inner wall of the tripod ring bracket is a concave-convex irregular structure, which is closely integrated with the lens; 2. The contact surface is plastic composite film, will not wear lens surface when installed correctly; there should be no stickers on the lens surface installation position, if there is, remove it, otherwise it will affect the normal installation; after installation, it can be freely rotated like the original tripod ring;.
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