Canon Drop-In Circular Polarizing Filter ACanon Drop In Circular Polarizing Filter A A drop in circular polarizing filter to reduce reflections from non metallic surfaces such as water, glass or pollution in the atmosphere and enhance colour saturation for bluer skies and greener leaves as you shoot. Designed to fit with the Filter Mount Adapter, the polarizing effect helps prevent glare from your shoots whilst providing greater clarity. Key Features: Drop in filter to reduce reflections and