BlueTech 40.5MM UV Ultra Violet For Nikon 1 AW1, J1, J2, J3, J4, J5, S1, S2, V1, V2, V3 Mirrorless Digital Camera System with 10mm, 18.5mm, 30-110mm Lens NOTE: This Filter is compatible with all 40.5mm lenses. Please Check your camera's lens thread size before ordering. UV filters reduce haze and improve contrast by minimizing the amount of ultraviolet (UV) light. Especially useful in areas of high altitude or snow, eliminating the undesirable blue cast. Filters serve as a great and inexpensive lens protector. Use one at all times to protect your delicate lens from dirt, scratches and accidental damage. Better to scratch or break a UV filter than an expensive lens.