iShoot Lens Flange Tripod Mount Ring IS-SM105ART Compatible with Sigma 100-400mm F5-6.3 DG DN OS (E mount) and Sigma 105mm F1.4 DG HSM Art (EF mount / FX / FE / L mount). Bottom features ARCA-compatible quick release system, compatible with ARCA-SWISS and RRS tripod ball heads. Features: 1. The lens flange is constructed from high-density, lightweight, and durable aerospace-grade aluminum, precision machined using advanced CNC technology. Hollow design processed with multi-diamond cutting for fine finish. 2. Tripod mounting ring surface treated with vibration polishing and multiple anodization processes, enhancing color uniformity and surface quality. Superior craftsmanship compared to molded products. 3. Tripod collar designed using laser scanning technology to accurately capture lens dimensions, ensuring precise internal shaping for secure fit. 4. Lens mounting flange engineered with reference to the Sigma TS-111. Inner diameter approximately 82 mm, width approximately 18 mm. Interior includes grooves and cutouts with a protective 3M plastic lining. Equipped with a non-slip locking knob. 5. Bottom quick release plate measures approximately 65 mm in length, conforms to ARCA-SWISS / RRS 39 mm standard, includes 1/4-inch and 3/8-inch threaded holes. Fitted with non-slip stainless steel screws. Net weight approximately 170 grams. 6. Quick release plate is standard ARCA profile, compatible with RRS, ARCA-SWISS, PMG, WIMBERLEY, MARKINS, PHOTOCLAM, SUNWAYFOTO, BENRO, SIRUI, MARSACE, and iShoot tripods with 39 mm dovetail rails. Compatible models include iShoot IS-JZ30, IS-JZ50, IS-JZ64, IS-QJ58, IS-QJ64-FD, IS-JZ60BK, IS-JZ70MFT, IS-JZ80BK. Compatible with: Sigma 100-400mm f/5-6.3 DG DN OS (E-mount) Sigma 105mm f/1.4 DG HSM Art (EF/FX/FE/L-mount) Not compatible with other lenses. Package includes: 1 x iShoot Lens Flange IS-SM105ART for Sigma 105mm F1.4 DG HSM Art and Sigma 100-400mm F5-6.3 DG DN OS (Additional items shown in images are for illustration only and not included)