1. The lens collar is tailor-made for and compatible with Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary Lens, cannot be compatible with Sigma 150-600mm f5-6.3 DG OS HSM Sports lens. | 2. The tripod mount ring's inner diameter is about 80.5mm, width is about 22.5mm, with 3M film inside, preventing lens from scratches; net weight is about 170g. | 3. The tripod collar bottom is added 75mm 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. | 4. The Lens support bottom reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screw for fixing lens to tripod directly. | 5. The tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish. The appearance and exquisite workmanship are much better than similar products made by mold.

1. The lens collar is made according to the shape and structure design of the lens, installed near the mount; | 2. The contact surface between the inner wall of the tripod ring and the lens is PVC film to reduce wear; | 3. When installing, loosen the knob, align the convex point of the lens with the groove of the ring body, push down gently, and lock it moderately; | 4. The tripod collar bottom is added 55mm long Arca fit quick release plate feature, can be used with 39mm Arca-Swiss fit tripod head and clamp directly, more practical than lens collars without QR-Plate; also reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly； | 5. The tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish. The appearance and exquisite workmanship are much better than similar products made by mold.

1. The lens collar is made according to the shape and structure design of the lens, installed near the mount; | 2. The contact surface between the inner wall of the tripod ring and the lens is PVC film to reduce wear; | 3. When installing, loosen the knob, align the convex point of the lens with the groove of the ring body, push down gently, and lock it moderately; | 4. The tripod collar bottom is added 55mm long Arca fit quick release plate feature, can be used with 39mm Arca-Swiss fit tripod head and clamp directly, more practical than lens collars without QR-Plate; also reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly； | 5. The tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish. The appearance and exquisite workmanship are much better than similar products made by mold.

1. The lens collar is made according to the shape and structure design of the lens, installed near the mount; | 2. The contact surface between the inner wall of the tripod ring and the lens is PVC film to reduce wear; | 3. When installing, loosen the knob, align the convex point of the lens with the groove of the ring body, push down gently, and lock it moderately; | 4. The tripod collar bottom is added 55mm long Arca fit quick release plate feature, can be used with 39mm Arca-Swiss fit tripod head and clamp directly, more practical than lens collars without QR-Plate; also reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly； | 5. The tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish. The appearance and exquisite workmanship are much better than similar products made by mold.

1. The lens collar is made according to the shape and structure design of the lens, installed near the mount; | 2. The contact surface between the inner wall of the tripod ring and the lens is PVC film to reduce wear; | 3. When installing, loosen the knob, align the convex point of the lens with the groove of the ring body, push down gently, and lock it moderately; | 4. The tripod collar bottom is added 55mm long Arca fit quick release plate feature, can be used with 39mm Arca-Swiss fit tripod head and clamp directly, more practical than lens collars without QR-Plate; also reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly； | 5. The tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish. The appearance and exquisite workmanship are much better than similar products made by mold.