49MM UV Filter + 49mm Rubber Lens Hood for Sony FE 35mm F2.8 ZA Carl Zeiss Sonnar T*, 49 mm Ultraviolet Filter & 49 mm Lens Hood Absorbs Ultraviolet Light - 3-Layer Multi-Coating - General Protective Filter Low-Profile Aluminum Frame - High-Transparency Optical Glass Tulip Lens Hood to Reduce Glare - Maintains Exposure Levels Brand New, Packaging Look at your lens for the symbol  (usually on the front) the number next to it is the filter thread size.