【Lens Protection & Prevent ultraviolet Ray】The NESCL 77mm UV filter can keep the lens front from damage, absorb ultraviolet rays, remove foggy issues, and improve the definition of the image. | 【German Optical Glass with Nano Coating】Made by importing highly transparent German optical glass(Schott B-270i). This filter boasts an impressive 99.9% light transmission and reduces the surface reflection of glass to 0.03%. Double side 30 multi-layer nano coatings, protecting the filter from water, oil, dust, and scratches and providing true-to-life images. | 【Titanium-Colored Brass Filter Ring】Filter frame is made of stable and durable brass frame, the CNC precisely machining knurled edges ensures a secure grip for easy filter mounting and removal, preventing binding and jamming | 【Ultra-thin】The 3.5mm frame minimizes vignetting even with wide-angle lenses. Our uv filters will not cause flare and dark corner in most usage scenarios | 【NOTE】Please verify your camera's lens thread size before ordering. Searching your lens and find the diameter symbol "Ø" followed by a number, this usually can be found on the front or side of your lens, or printed underneath the front lens cap-this magic number is your filter size. We have checked all the filters before send them out. If you fee unsatisfied in any way, please email us. We will provide you with satisfactory solutions.