ITEM NAME:49mm Vented Curved Metal lens Hood For Leica Canon B1M6 Hot Nikon G6A8 Pana J1Q4 Description&Preview.It will fit for all 49mm size lens. Thread : 49mm. Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. All pictures are for illustration purpose only and Colours may vary slightly.