To filter:
The filter is made of glass, thus relatively heavy and probably also quite prone to breakage. In addition, the filters can be very difficult to insert in the Lucroit filter holder (the filter is thicker than others and has no cut corners.
The filter is indeed much more neutral than the Prostop filter manufacturer, but away from the neutrality of Hoya prond a piece.
The delivery was unfortunately not as advertised, it was missing the filter bag and foam gasket, but the filter ND0.9 u. ND1.8 was only in a thin plastic bag, in a huge Art Stuff Box ND3.0. How is one that fits in your camera bag, either one has breakage or space problems.
Conclusion:
much better than other filters, but as neutral as promised not again. If he had that, I would keep the filter, but I'll send it back Due to this high price and get me a better Prostop. Although having more color cast, but with the Photoshop function "Match Color" allows the slightly offset if you have made for a photo without a filter.