The KASE K100 100mm adapter fits into the lens threads for the K8 / K9 100mm filter holder attachment. It is a very light adapter, due to it is made of anodized aluminum, it is resistant to corrosion and its matte finish does not reflect light.
The 100mm system works with lenses that have threads from 49mm to 82mm.
Ultra Low Color Cast, Ultra Low Reflection
Nano Coating on Both Sides, Water & Oil Repellent
Environmental Optical Lens glass(H-K9L)
Provide 4-stop graduated light reduction