I love these magnetic filters. I did have to get some step-up kits for it as my lenses are NOT 77mm, but a step-up doesn't cost a bunch.

The magnetic attaching feels great and holds on perfect. Even swinging the camera around really quickly doesn't loosen the filter or let it fly off the camera which would be a nightmare. Was one of my biggest concerns switching over to these filters. The pouch it comes into is also wonderful to keep them all together. Glad I wont be searching for them forever or losing them. I've already recommend many of my photography friends to pick this up.

I am very satisfied with the optical quality of this filter. Especially in comparison (eg with Cokin) it proves that you don't work with a plastic toy. The transitions are smooth and not immediately (frighteningly) noticeable

I'm a big fan of the magnetic filter kits - this is actually my second one from K&F Concept. The magnets are strong enough to provide secure hold, but are still easy to change without fumbling or fear of dropping. p

These diffusion filters create nice pretty effects in my test shots. I love how they look with warm light, but they create some really fun and cool effects with colorful studio-type lighting as well. I really am happy with this set, and I would recommend it.

I am very satisfied with the optical quality of this filter. Especially in comparison (e.g. with Cokin) stell

I have used numerous filters, from Cokin, to buying several for different sized lenses. And, I do a serious amount of light and strobe painting (do a you tube search, if you're curious). So, when I dropped my super expensive ND filter, I was crushed! Right up until I found this K&F Concept ND, which offers a "Variable Neutral Density". Imagine looking at purchasing an ND Filter for the Typical four hundred bucks (and, that is only for a single fixed ND number)? Oooor, grabbing this well constructed, high quality ND filter that you can adjust to your liking ON THE FLY! Still thinking...
Buy it Bonehead!

I have used numerous filters from Cokin, buying several for different size lenses. And I do a serious amount of light and strobe painting (do a YouTube search if you're curious). So when I dropped my super expensive ND filter I was devastated! Until I found this K&F Concept ND that offers a "Variable Neutral Density". Imagine buying an ND filter for the typical four hundred dollars (and that's only for a single fixed ND number)? Oooor, grab this well constructed, high quality ND filter that you can tune to your liking ON THE FLY! I still think...
Buy it Bonehead!

I chose the K&F because other kits start at ND4 and end with ND32. The ND4 in places where there are usually fairly sunny days I don't see much use and the ND32 is a bit short at times so I decided to use at least an ND64 to be able to reduce the shutter speed further and I was right . The quality of the glass is quite good, with no color dominants. The polarizer does its job. You have to adjust it (with the wheel inside) to avoid reflections and you have to do some tests before you start photographing/recording so you have to land it to fix it. Happy with the quality of the product and the results. Although I would like them to have the option of a kit with an ND1000/ND2000 as well,

I like the quality of the materials. They're all metal. I have seen many kits but they are all plastic especially this one because the comments caught my attention.
The filter is made of glass and the quality is very good. The only thing I noticed is that it loses a bit of saturation and the white balance is a bit bluish, but it's easily remedied when processing RAW. They increase color temperature and saturation.
If you want to enter the world of filters for this price, please don't think about it. Excellent results.