Blocks Environmental Reflections, Fits Lenses up to 8" in Diameter, Works with Lenses as Wide as 15mm, Opening Measures 12 x 13", Suction Cups for Mounting. The LENSKIRT XL Flexible Lens Hood features suction cups that attach to glass to help block out internal environmental reflections while shooting. This allows you to shoot photographs and video through glass without worrying about lights flashes or you showing up in the final image. It opens up with a drawstring in order to fit securely around your lens. It is compatible with lenses up to 8 in diameter and the 12 x 13 opening will work with lenses as wide as 15mm. The LENSKIRT XL allows for more room to position your camera at an angle or tilt without seeing the edge of the Lenskirt. This is useful when shooting time lapse out of a tall building capturing the view below.