1. The lens collar is designed and improved based on the original model E (B), only compatible with Canon RF 100mm f/2.8L Macro IS USM, cannot be used with other lenses. Like the original factory, it supports horizontal and vertical shooting. When shooting vertically, the lens can be rotated by loosening the knob; | 2. The plastic ring is made of PC material and made from precise molds; the inner wall of the ring is designed with three bumps on the surface, corresponding to three notches on the surface of the lens; the plastic ring weighs about 10g; | 3. The tripod mount ring adopts a split structure, the edges and corners are polished, and the inner wall is affixed with a plastic film, will not wear lens surface when installed correctly; the locking knob has a non-slip design, released and pulled out to unlock; hollow-out weight reduction design, net weight is about 165g; | 4. There should be no stickers on the lens surface installation position, if there is, remove it, otherwise it will affect the normal installation; install the plastic ring first, when installing, please align the points carefully, otherwise the plastic ring may be offset; and then install the metal tripod ring; | 5. The tripod collar bottom is added 70mm long 39mm 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; also reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly.