Compatible with Sigma Lens: 16-300mm F3., 5-6., 7 DC OS (E / X / L / RF Mount) Tips: There should be no stickers on the installation position of the lens. Lens Collar Tripod Mount Ring Holder for Canon RF 100-500mm f/4.5-7.1L IS USM Lens Collar Tripod Ring Tripod Ballhead, Tripod Panning Head & Fluid Head, Tripod Quick Release Plate On Sale Sigma 16-300mm Lens Collar Tripod ount Ring, for Siga 100‑400 F5‑6.3 DG DN OS E ount, with 1/4in 3/8in... The appearance and exquisite workmanship are much better than similar products made by mold. iShoot 360° Panoramic Tripod Ball Head with Lever Clamp for Manfrotto 200PL / 410PL & Arca Fit Quick Release Plate $149.99 / piece iShoot Lens Collar Tripod Mount Ring IS-SM1630 Compatible with Sigma 16-300mm F3., 5-6., 7 DC OS (E / X / L / RF Mount) Bottom is 39mm Arca Fit Quick Release Plate Feature, Compatible with RRS / ARCA-SWISS Fit Tripod Head Clamp & Arca Fit Stabilizer Main Features: 1., The lens collar IS-SM1630 can be combined with clamp mount converter IS-3950PRO (Sold Separately), which can be used for fluid heads and stabilizers with Manfrotto 50 structure; 2., The tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish.