100*100mm at 2mm thickness.
High quality optical glass material.
Reduce reflection,scarch and water proof coatings on both sides.
No color cast,and high sharpness.
Fits to Haida 100 series insert(square)filter holder(Model No.:HD2500,HD3300).
ND filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally...