K&F Concept49mm Variable ND Lens Filter ND2-ND400 (1-9 Stops) 18 Multi-Layer Coatings Adjustable Neutral Density Ultra Slim Lens Filter for Camera Lens (K-Series)

Every shot I take is behind a K&F filter the image quality is never distorted and I love the quality the put into all their products.

Rather than having a bunch of ND filters for one lens, this variable ND filter works perfectly for all use cases. It fits the threading in the size, it feels sturdy and works perfectly. It can get extremely dark to the point where it is nearly pitch black. The price is very good as well for what you get.

This is not a bad filter for the price. I took it out for a trial run doing some waterfall shots this past weekend (you can see the results attached). My overall impressions:- The picture quality was pretty good, but not always tack sharp.- It does suffer from the dreaded black X at the MAX ND setting, but no issues on the lower settings.- It was nice to be able to adjust the ND setting on the fly rather than having to swap out filters. In fact, I frequently found myself adjusting it to the MIN setting to check composition and then moving back towards MAX to take the shot.- The build quality seems good and turning the filter felt smooth and fluid.- No hard stops at MAX or MIN settings, so you have to pay attention there.- The indicator dots don't tell you what ND setting you are on, so you need to keep track.- The filter is larger on the incoming end, so the lens cap from your lens will not fit.- I notice some lens flare with the ND filter when the sun is near the viewing angle that don't show up with just the lens. Since my lens shade does not fit due to the filter end being larger, I had to manually shade the lens to make the flare go away.Overall, pretty decent for a variable ND filter. I probably wouldn't use it for professional-quality pictures, but it works for someone just wanting to try an ND filter and not wanting to have to lug around a whole set of filters on a shoot.

Great ND filter. Variable and great picture quality.

You can just feel the quality of the lens from the touch. Looks great and seems versatile. I definitely recommend it rather than buying a bunch of ND filters and having to carry them. Also, K&F Concepts seems on the cutting edge and they have great prices for great quality. Don't hesitate to purchase!

Well, the ND filter simply does its job. It gives me a lot more control over the 16mm f/1.4 lens from Sigma, which is an excellent piece of glass. Since it is a fast, wide angle lens, there can be challenges which are easily dealt with using an ND filter. I did read the comment from a reviewer that mentioned an dark "x mark" across his image. I had to see if I could replicate it with this. I cranked the filter way past what I would have normally set it for, and was able to see the x as well. Neat. It's easily fixed though. Just don't "crank" an ND filter further than is necessary. I have a feeling that most all of them will exhibit the same characteristic, so it's just a matter of operator procedure to see that it doesn't happen. Honestly, I had never noticed it, simply because it was a setting that was never called for, given any of the lighting conditions I was shooting in. I can go to manual settings on my camera, and get a blacked out image, if I push the settings into "deep space", but why would I? Otherwise, the filter shows good edge sharpness, and no detectable distortion, but I'm not terribly picky. It gets rid of what problems I might have had with a high speed, wide angle lens, which is what I bought it for. Nice ND filter, and I'd buy it again.

High quality and optically superior to other brands. Perfeyfor shooting video on nright sunny days!

This filter is, to be fair, solidly built and a pretty decent performer for a low price. It's allowed me to get some long exposure shots that I wouldn't have otherwise captured, so that's cool. All that being said-The image quality of this filter falls of sharply the closer you get to the max ND setting. The more ND effect is applied, the more you start to see dark bands in the corners and sides of the image. These are difficult to correct for in post production. It's not very noticeable in a busy scene, like in a forest, but is VERY apparent when against the sky. Like, almost unusably bad. So consider carefully what you're going to be shooting with this filter. If you just want something to darken a flash a bit or to take long exposures of waterfalls deep in the woods, it works great. Especially at the more moderate ND settings.If you're a landscape photographer though and the sky is often featured in your photos, this is not the filter you want. Getting a useable image at high ND settings in this scenario requires a lot cropping and manual corrections that still don't look quite right. Pony up for a spendier filter in this case, there's no way around it.This thing also changes the outer thread diameter when it's installed, so your lens's cap won't fit any more as long as it's attached.