1. The lens collar is tailor-made and only Compatible with Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary Lens (EF and F Mount), Not Compatible with Sigma 100-400mm f/5-6.3 DG DN OS (E-mount and L-Mount) and other lenses； | 2. The tripod mount ring is tailored to the lens. Cannot be rotated, with 3M film inside, inner diameter is about 84mm, width is about 23mm; | 3. Bottom is added quick release plate feature, plate length is about 70mm, with 1/4 and 3/8 screw holes and stainless steel anti-slip screw, net weight is about 160g; | 4. This lens holder bottom is Arca-Swiss fit quick release plate, compatible with RRS / ARCA-SWISS / iShoot 39mm fit tripod head clamp; | 5. The lens collar is made of aviation aluminum, CNC precisely machined, hollow-out weight reduction design, surface polished and anodized, with stainless steel screw.

1. The tripod mount ring is tailored to the shape and structure of the lens, compatible with Canon RF 70-200 F4L IS USM lens perfectly, retains the switch function, and the tripod ring fits closely with the lens. This lens collar can't be used for other lenses; | 2. Stickers cannot be attached at the installation position, otherwise, the tripod ring cannot be installed, so if any, remove them. After installation, the camera can only shoot horizontally, not vertically, or be rotated. | 3. The tripod ring adopts irregular shape, and the edges and corners are polished. The shortest inner diameter of the lens holder is about 79mm, and the surface contacting the lens is affixed with 3M plastic film, preventing the lens from scratches; the maximum width of this contact surface is 22.5mm; net weight is about 170g. | 4. The tripod collar bottom is added 50mm long Arca fit quick release plate feature, can be used with 39mm Arca-swiss fit tripod ball head, panoramic head and clamp directly; more practical than lens collars without QR-Plate. | 5. The Lens support bottom reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly. The lens collar IS-RF7204 can be combined with clamp mount converter IS-3950MFT (Sold Separately), which can be used for hydraulic heads with Manfrotto structure.