iShoot Lens Collar Tripod Mount Ring IS-SM105ART Compatible with Sigma 105mm F1.4 DG HSM Art & Sigma 100-400mm F5-6.3 DG DN OS Bottom is Arca Fit Quick Release Plate Feature for RRS / Arca-Swiss Fit Ballhead Clamp Features: 1. The lens collar is made of high-density Aviation Aluminum, lightweight and solid; precisely machined by world-class high-end CNC turning center; hollowed-out work processed by Multi-Diamond Cutter finely; 2. The Tripod mount ring surface using vibration polishing technology and multiple anodic oxidation, greatly increased the color uniformity of the metal surface; the appearance and exquisite workmanship is much better than similar products made by mold; 3. The tripod collar using laser scanning technology to accurately obtain lens parameters, and then accurately carve out the shape of the inner diameter of the tripod ring according to the data; 4. The lens support collar is designed and improved with reference to Sigma original TS-111; inner diameter is about 82mm, width is about 18mm, the inner wall has grooves and notches, and 3M plastic protective film is attached; locking knob with non-slip design? 5. The bottom quick release plate of the Lens support is about 65mm in length, adopts ARCA-SWISS / RRS 39mm standard fit, and reserved 1/4 and 3/8 screw holes, equipped with stainless steel non-slip screws, net weight about 170g; 6. Bottom quick release plate is AS standard, compatible with RRS / ARCA-SWISS / PMG / WIMBERLEY / MARKINS / PHOTOCLAM / SUNWAYFOTO / BENRO / SIRUI / MARSACE / ISHOOT ball head of Arca 39mm fit, suitable for 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) Can't be used for other lenses Package Includes: 1 x iShoot Lens Collar IS-SM105ART