Now switch your filter in 2-3 seconds with Freewell Quick Swap Magnetic system no more threading Optical Glass: Made of using the High Definition Premium Optical glass double-side multicoated Zero chromatic aberration (color shift) Coating: Each side of the glass element is coated with Waterproof, Dustproof, Scratch-resistant, Oilproof Function: Create a blue anamorphic style effect without using expensive lenses