small disclaimer: I'm not an ND1000 filter person, I find their water/cloud smoothing effect mostly unnecessary and overdone, overused and overpowered (and many more overs). I said that I need a little more than ND64 every now and then, so I decided to give this KF a try, especially since it came in at 40 EUR with a Black Friday discount. I didn't expect miracles and was prepared for severe color casts. It turned out better than I expected. With this filter there are obvious color casts (photo 1) and to all the claims of "I don't see any cast" all I can say is turn off the AWB please how else can you talk about color casts seriously?! but with the WB adjustment it corrects (photo 2) very close to original colors without this ND1000 (photo 3). Correction scale: 5000K->7200K and 0->+35 magenta in Lightroom. As expected, the sharpness for a wide-angle lens (35 mm) is perfectly fine. I do notice more vignetting (both lenses have the same degree of lens correction), which I'm not sure how to explain, but I personally don't mind, some in landscape shots. Overall I'm pretty happy. It's a cheap alternative to brands already known for heavy blue casts (love your ND graduates, Lee, but your Big Stopper is pure and simple a blue filter, period) and for casual use, you really can't do more expect