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 opt: Through precise processing, opt distortion is reduced to ensuring that the imaging is not affected and the expression of the work is Excellent sealing: ensuring a tight connection between the lens and the camera, effectively and from entering, and protect internal components This large format lens retaining rings precisely engineered for 3S sized lenses, ensuring a to maintain optimal photographic and durability in demanding conditions 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