I think by now we all know the uses for these types of ND filters, and I'm not going to explain them. What I'm going to tell you is why I chose this kit of four ND filters instead of one variable ND filter.

The first reason is very simple: I won't have problems with strange effects like the so-called X vignetting or having some areas filtered more than others, more sharply at the edges. With these fixed filters, I know I'll have the same amount of filtering across the entire area and without strange effects.

The second is that with the variable filter, you have 1 to 5 stops or 1 to 9 stops, and you can't go any higher if you need to for artistic reasons. With these fixed filters, I can put several together and get any number of stops I want, up to a limit: the sum of the 4 separate filters, of course.

And third and last, if I combine an ND filter with a polarizer, a color gradient, or any other filter that can rotate, I run the risk of accidentally changing the ND filter factor on the variable filter when adjusting the polarizer or gradient. Yes, I know, you can see this on the screen or in the viewfinder, but you're already wasting time adjusting the ND filter again, while with these fixed filters, it's never going to happen to me.

Having said my reasons for choosing these filters, I'd like to tell you that they come in a sealed box, and inside it is a practical case with a magnetic lid and a zipper that provides access to the four filters. It has a ring to hang it from your backpack and a loop to attach it to your belt for quick access.

These are made of aluminum, and the filter itself is made of glass. According to K&F, it has 28 layers of nano-coating and an optical resolution of up to 8K.

Each filter is clearly identified with the ND number, ranging from ND4, ND8, ND64, and ND1000, as well as their diameter. In my case, it's 67mm, as I buy this size so they fit all my lenses, except for my Sony 200-600mm, which is 95mm, since I use adapter rings. I think you can see it in the photo I posted with one of my cameras. You can buy these rings right here on Amazon, and they're from the same brand, K&F.

A downside is that it can be installed as such. I think there's one more filter missing, which I already had because it's the most commonly used: the ND32. But if you don't have it, it won't be a big problem, and you can buy it separately later, if you want.

K&F has done its job well again, releasing this ND filter kit that's a must-have in the backpack/bag of any photography/video enthusiast or professional. It also includes a handy storage/transport case for a more than competitive price.