I bought this filter, tempted by the low price and the fact that it is small and light and allows me to have several panels together in a single accessory, since I already have panel filters and in addition to 150x150 that are really uncomfortable too are wearing.

The product looks very well packed in its case, it is very light and made of metal material with the various notches that indicate the ND phrase. Maybe I would have preferred to have actually written about how many stops there were without having to bother trying to figure out how many ND I was each time. (but maybe space doesn't allow it).

I am satisfied with the purchase I made because it exceeded my expectations. In fact, I ran some unpretentious tests on the fly, and the result I would say is not bad at all.. I
tried it with a focal length over 50mm, where I had no problems and the picture with a uniform exposure without a halo results, but it must be said that I also only tried it at ND400 without trying the intermediate stops so I couldn't tell what happens at a bottom stop; Unfortunately being in the middle of the day didn't allow me to do other tests.. (Of course I'll update if I can by adding more details).

Finally I don't think there is anything better in terms of quality/price, at least for the ones I've tried and K&F is improving year after year... I'm attaching a few photos to remind you of

the product and the draw attention to the result...