【Function】UV filter has two functions, one is to absorb UV ray and weakens the blue tone in images caused by UV, ensuring clarity and color. Another is to protect the lens away from dust and scratches. 【Import Optical Glass】K&F Concept UV filter is made by importing Japanese AGC glass for razor-sharp images while maintaining the true color of photos. 【NANOTEC】This UV filter with 28 multi-layer coatings, hydrophobic, scratch resistants. The 99.6% transmission, effectively reduces the reflection coming from both the ground and the filter itself, ensuring the true color of images. 【Telephotos Lens No Vignetting】K&F Concept HD UV filter frame only 3.3mm with double side polishing technology no vignetting and the images still clarity even on telephotos lens. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always proceeded by a "Φ" (diameter) symbol. For example: Φ77= 77mm lens thread size. New and old packages are sent randomly UV filters are mostly used to protect the camera lens. It’s much cheaper and easier to replace a UV filter than to replace a broken glass.