K&F CONCEPT 49mm 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)

So great! Easy to use, looks great, fits perfectly and it's wroth every penny. Comes with a case to protect the lens, and differently from other brads it gives a clear look, only gets a lil bit of vignette if you use 0.5 lens

This K&F Concept Variable ND lens filter is great, I have already got 2 other K&F Concept filters from recent years, which are also very good and i like very mcuh ! It has "True colour" and maitains the sharpness of th!e image The filter has excellent build quality, and it has a solid metal frame. It has a premium feel to it and precise in use. It also seems to have great performance, much better than cheaper other-brand filters. It is easy to attach to the lens, very durable, and i think it is a very good "value for money" filter

Adds a green hue and has vignetting at the max ND stop. AWB or manually setting WB will fix this, and I don't need the max ND stop, so for me this is OK, but they could be issues for others. Otherwise, works as expected, and is cheap! I bought the 46mm and 37mm versions, happens on both fyi.

I absolutely love this ND Filter! I have it in three different sizes. It attaches easily to your lens and works great. I love that I get to choose how dark I want it to go. It does give off a slight yellow/greenish tint but I don’t mind it. Definitely a great product for the price!

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.

Great ND filter for the price, plug in play and fit easy to my 43mm filter size. Wide range of you need to it to be truly dark (like taking a picture of the sun)

So far so good! Bought this to take on a roadtrip from CA to OR. I knew we would stop a lot of creeks, waterfalls, and shores and it did not disappoint! I was able to play with long exposures in broad daylight. Build quality is nice. Very sturdy metal and the glass is quite pristine and clear! What I love is that it came with 3 travel micro cloths.

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.

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Quality is ok, but there's a minute hairline scratch on the edge. But not noticeable while firing a shot or even after, so I choose to go with it without a replacement. So be careful by thoroughly checking yours.

good product and fast shipping

nice filter