Considering buying the Samyang 14mm f2.8 for landscape photography. I was wondering if anyone out there knows if I can attach a filter holder/adapter with this lens. I found this site offering the holder and the adapter for the Samyang but I am not sure about the quality of this product. Anyone used this product from Lucroit (Hitech Filter Systems) or know any other brands that make filter holders/adapters for this lens? Also, was wondering if system will take Lee's square ND/GND filters?