This large format lens retaining rings precisely engineered for 3S sized lenses, ensuring a to maintain optimal photographic and durability in demanding conditions Superior opt: Through precise processing, opt distortion is reduced to ensuring that the imaging is not affected and the expression of the work is Strong compatibility: In addition to the 3S lens, the door pressure rings of models are also compatibles other types of lenses, increasing the flexibility of use Constructed from high strength aluminum alloy, it features a lightweight design for easy portability, robust resistance to daily wear and impacts, and user friendly installation for quick camera lens repair Excellent sealing: ensuring a tight connection between the lens and the camera, effectively and from entering, and protect internal components