1. The lens collar is designed based on the shape and structure of the lens; only compatible with Nikon Nikkor Z 28-400mm F4-8 VR and Z 70-180mm F2.8 Lens; cannot be used with any other lens; | 2. The inner wall of the lens ring is pasted with PVC film; there should be no stickers at the installation position, if there is, it should be removed, otherwise it will affect the installation; | 3. When installing, please loosen the knob, the groove on the tripod ring is aimed at the white bump on the lens, gently push down, and lock it moderately; The tripod ring supports vertical shooting, when shooting vertically, remove the lens and reinstall it, and cannot rotate directly on the lens surface; | 4. The tripod collar is added 50mm long 39mm Arca fit quick release plate, 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 bottom of the plate is improved with new design, which is also compatible with the handheld stabilizer with the same structure of Arca-Swiss;