Superior opt performances: Through precise processing, opt distortion is reduced to ensuring that the imaging quality is not affected and the expression of the work is improved Excellent sealing: ensuring a tight connection between the lens and the camera, effectively prevent dust and moisture from entering, and protect internal components This large format lens retaining rings precisely engineered for 3S sized lenses, ensuring a perfect fit to maintain optimal photographic performances and durability in demanding conditions 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 Strong compatibility: In addition to the 3S lens, the door pressure rings of some models are also compatibles other types of lenses, increasing the flexibility of use