But if you want to know and advance into the high class area. An ND filter reduces the incoming light. In the case of this ND1000 by 10 f-stops. This makes it ideal for long exposures and to "artificially" extend them. Especially with moving processes such as rivers, waterfalls, road traffic and others, beautiful soft gradients can be achieved. The filter comes very nicely packaged and is a lot of fun unpacking. Anyone who loves unboxing will get their full enjoyment here. The filter comes in a cloth/leather bag. Very nice in itself, but in my opinion a filter sits more snugly in the well-known plastic boxes. The inside of the packaging can be converted into a "picture frame". Funny idea but I think there are nicer ones. But let's get to the filter itself. Here I have to say again that the performance matches the price and is absolutely justified. Flawless workmanship, both on the filter thread and the glass. The filter can be easily and well unscrewed and released again. No comparison to cheap filters. The glass is of the best quality and the optical performance cannot be distinguished from other ND filters from well-known competitors. In this way you have an even darkening over the entire image without loss of quality or any color casts. In summary, a very good filter in terms of quality and optical performance. It has weak points in the somewhat loose fixation in the storage bag, which costs half a star. But we're still rounded up to a full 5 stars and a buy recommendation.