I already have quite a few filters at home, including the K&F Concept Nano-X ND Filter 77mm Variable Gray Filter ND2-32 for 75 euros, which I use on my wide-angle lens, e.g. in bright sunshine (for wide-angle shots) and for long exposures and it's really good.Now I was allowed to test the variable ND filter from the PRO series from K&F, a filter for a whopping 280 euros. Of course, if you are already working with filters, you should also use high-quality glass on a high-quality lens, but a filter for just under 280 euros is not trivial and this investment should be well thought out. What I can say in any case: The filter is not only at the top in terms of price but also in terms of performance and processing. So I can work with my lens in bright sunshine with an open aperture and, if I like, also realize long-term exposures with a slightly closed aperture with the help of the filter. As I said, the image quality is as good for me as if I hadn’t had a filter on the lens at all and that’s how it has to be that is. The pictures I uploaded (undemanding test shots) were taken with the aperture open and against the sun. My conclusion on this filter: Very high-quality workmanship/image quality without errors/haptics excellent. Price very high Everyone must now decide for themselves whether such an investment is possible. The shots I uploaded (undemanding test shots) were taken with the aperture open and against the sun. My conclusion on this filter: Very high-quality workmanship/image quality without errors/haptics excellent. Price very high Everyone must now decide for themselves whether such an investment is possible. The shots I uploaded (undemanding test shots) were taken with the aperture open and against the sun. My conclusion on this filter: Very high-quality workmanship/image quality without errors/haptics excellent. Price very high Everyone must now decide for themselves whether such an investment is possible.