K&F CONCEPT 67mm Variable ND2-ND400 ND Lens Filter (1-9 Stops) for Camera Lens Adjustable Neutral Density Filter with Microfiber Cleaning Cloth (B-Series)

I've been very impressed with this item for the past 2ish years. It's been a durable design at a very affordable price. It fulfills everything that it said it would and is easy to install and use. My images are still very clear and not cloudy as I use the filter.It makes a huge difference in my image using this filter to help reduce the harsh light coming into my camera. There is a slight vignette on the image, but not drastically noticeable.The only downside is the lack of gauges to keep track of what stop the filter is at. It requires you to watch the LCD screen as you turn the knob on the filter. Still happy with the product, but wish there were numbers on the filter. Overall, highly recommend, especially for the price!

Perfect fit on my sigma 24-70. Fantastic and durable build quality. The adjustments on the filter are smooth, precise, and FAST. Shooting outdoor video calls for quick adjustments - and this filter makes it happen. It’s light, and has a way of making it seem like it was a part of the original lens design.I get beautiful bokeh with my wide open aperture, and the filter preserves the stunning lens flares from the natural sunlight. For the price - the return off of this filter is undeniable. CINEMATIC.

Absolutely LOVE this lens filter. Feels real and heavy duty, works smoothly, and great range of density.

For the price this filter is well made and gets the job done. The step downs are perfect increments for my needs. My only issue is that at times I get 1-2 green flare spots on my image, especially in really bright sun. Tends to ruin the image unless able to use AI to remove. I have cleaned the lens and filter repeatedly so it definitely appears to be a filter issue. Also impossible to put the lens hood back on over the filter which might just offer enough shade to prevent the flares.

Love my filter. Making a difference in the pictures that I capture. Great price. Shipping was great as well.

Works great! Fit perfectly on the Canon R50 kit lens. Used it to take long exposure shots of moving water between 1 and 30 seconds. They turned out fantastic. It slides easy to adjust the effect. Not much else to say. Was very happy with the results.

Quite literally the best filter I've gotten, it manages the brightness really good considering how much it is. It makes the Images really crisp, cannot forget that it also adds a layer of protection. Also has good dust resistance for its value.

I'm just a novice photographer, with limited experience using filters. That being said, I know my way around exposure settings and fairly literate with the technical specs of my cameras.I wanted to take some smooth pictures of waterfalls and saw this variable ND filter with good reviews. On the item description page, there's plenty of warnings to make sure you buy the right filter thread size for your camera, which seems pretty obvious. However, they don't mention that this ND filter is poorly suited to wide angle lenses. For reference, I had paired this filter with a Zeiss Touit E 12mm f/2.8 mounted on a Sony a6500.After coming back from vacation, I realized that many shots I took with the filter mounted had pretty poor light uniformity. I did notice while taking the photos that rotating past a certain point produced noticeable unevenness, but the effect was less/not noticeable when I turned the ND down. However, upon checking the images on a computer monitor, it was obvious that the brightness is not uniform.I asked the seller about the issue and copied/pasted their response below:"Darkness is a common issue with wide angle lenses and variable ND filters. Physics limit the capabilities of variable ND filters on wide angle lenses. When you enter the edge of the max range,the darkness may appear on your image. Because you are using it beyond its capability according to the laws of optical physics,which will inevitably cause this phenomenon. could you try to turn down the degree until the black fade away?"So I guess I'll chalk this up to inexperience on my end. Still, I'm docking 2 stars because it's not documented anywhere on the item page which focal lengths are supported, which can lead to some mislead some buyers. Also, it's not really feasible to tell if there is a slight amount of uneven brightness while taking the shot or previewing in camera. Thus, you can end up with a bunch of bad shots that you wouldn't know about until you get back to a monitor.