I used this today for the very first time. There was no colour cast. The pictures were sharp, and processed very well in Lightroom. Canon RP and 24-105L.

This was one of my best ever purchases. It is easy to screw onto and remove from the front of my camera lens, easy to adjust and delivers excellent slow shutter speed shots without any apparent loss of photo clarity. Not expensive and is always part of the kit I carry around. Full marks.

Works as described. A little bit of colour cast, but nothing egregious. All metal construction with a smooth non-hardstop dial. The glass for the money is very good. Not for professional work, but great for small project.There is a X pattern if you rotate the dial completely, past the min and max marker, but thats true about all ND filters without hardstops. I dont see this as a problem with the dial not being so loose that it could spin unnoticed. For people to encounter that X pattern in their images, they would have to be pretty negligible.

Well worth it. Zero complaints and I like K&F Concept Pro line quality. It's competitive.

Makes a big difference in capturing a bland sky which otherwise would be featureless.

I love k &f concept filters they are very well made of quality materials I no longer look at other brands as they are priced well also this is my 4th purchase of their filters also normally come in a well made pouch

Very good budget filter, love the reds and blues I'm getting from this but not overly keen on the greens. Otherwise love the results

I don't know what all the other reviewer are talking about when mentioning spots, Mine, all the way to the darkest setting was perfect. Seriously. Maybe i got lucky and got a really good unit?

A good quality product at a reasonable price. Item arrived on time, well protected to combat distribution knocks and bumps. A good screw fit when presented to lens. Awaiting better weather to test in the field.

If you shoot photo (or specifically video) outdoors in the sunlight, you NEED a variable ND filter.

For video, if you're shooting 30 FPS, you need to keep your shutter speed at 1/60 (because of the 180 rule) for natural blur and smoothness. If you want a nice blurry background at f/2.8, even at ISO 100, there's a great chance your image will be horribly exposed. Your only options are to increase the shutter speed (and compromise the natural look with distracting "choppiness") or crank up to f/16, which will flatten your image and get rid of that blurry background you wanted!

In comes the variable ND filter. When applied, like variable sunglasses, it allows how much light passes through, kind of like an intimidating bouncer at a night club. So just twist the ring on the filter and you can achieve your shot perfectly!

With this specific filter, two small things bummed me out:
1. The ring doesn't have actual stops, just continuous rotation so you can't really keep track of the specific amount of light you're letting in.
2. When the filter is on my Tamron 28-75 2.8 lens, I can't put the lens cap on at the same time. Not a deal breaker, but annoying when you want to quickly take a picture or shoot some video.

But for the price, it's hard to argue this isn't a great purchase.