Fotodiox Pro 6.6" x8.6" Rectangular 0.9 (3 Stops) Soft Edge Graduated Gray, Neutral Density (ND) Filter for WonderPana 66 System Holder

Fotodiox Pro 6.6x8.6" filters are the strongest in the industry at 4mm thick. Fotodiox 6.6x8.6" filters are practically unbreakable and are guaranteed spectrally neutral to within + or - 3 in the a and b channels of the lab color space. Fotodiox Pro filters are also guaranteed to be within + or - 2 in regards to total light transmission. Fotodiox currently offers 6.6x8.6" in 4 Graduated Neutral Density (ND) filters: .6 Soft Edge, .6 Hard Edge, .9 Soft Edge and .9 Hard Edge.