What a great idea! Combining a Black mist filter with a variable ND filter! While I usually had to superimpose two filters to obtain the same result, K&F had the excellent idea of ​​offering this filter combining the two filters... First of all, the design is flawless! As is often the case, K&F offers a very high-quality product at a particularly well-considered price... The packaging is no surprise, it displays the brand's usual beauty standards ; ) It contains a good quality plastic protective box that will very effectively protect the filter before it is attached to your favorite lens or filter holder. The finishes inspire confidence and we really enjoy using this filter during our photo/video outings. The thread is impeccably machined and the attachment to my anamorphic lens is done without any difficulty. Once attached, the filter loses the "too precise" aspect specific to videos or photos obtained with an iPhone... it creates a slight cinematic blur and this is mainly felt in intense lights... they become more vaporous and less harsh. In case of strong general brightness, this allows greater latitude in the settings of its application. Finally, it remains at this time always attached to my lens. For me it is a must have and as often, K&F concept does not disappoint. Only the microfibers are a little questionable... instead of the 3 microfibers offered I would have preferred to have only one but larger. Because the size of those offered does not allow easy use to clean the lens... But this of course does not detract from the quality of the filter itself.