The K&F Concept filter arrived in a round protective case that seems to be universal as it'll fit many sizes of filters.
The filter itself is visually high quality and has knurled grips placed on opposite sides of the filter to provide good grip. The filter is very lightweight due to the aluminum frame construction and thin glass. The filter is very low profile to minimize vignetting but still has threads for stacking other filters.

With all these new product releases K&F has been doing recently it is obviously they have decided to really step up their game in regards to the actual quality of their products. This ND filter is a great example of that.
This is a glass filter and the coating they are using seems to help with flaring pretty well. I am noticing it doesn't attract dust particles as some of my other ND filters so. It is a thin filter with little ridges on opposite sides so it attaches very easily to my lenses.
Most importantly I am seeing very little color cast with this filter which kind of blows me away considering the price.
Whatever K&F has been doing lately I hope they keep it up. Both this filter and their recently released Black Mist filter have just been fantastic at a price point that makes them so much affordable to a wider audience.

First I must say that I am a reviewer and I received this K&F Concept 58mm ND8 (3 Stop) Lens Filter, Fixed Neutral Density Filter with HD 18 Layer Dual Side Multi-Coated, Ultra Slim Frame Optical Glass Nano-X Series for Camera Lens free as part of the program. the program was designed to generate reviews of new products hear at amazon. ND filters are for shooting long exposures and not not over exposing the shots or changing the colors. The filter reduces the intensity of all wavelengths of light equally, giving no changes in hue of color rendition. It filter is to reduces the amount of light entering the lens. Doing so allows the us to select combinations of aperture, exposure time and sensor sensitivity that would otherwise produce overexposed pictures. There are diffident ND filters for controlling the amount of light entering the camera this one is three stops. This K&F Concept ND8 Filter is well made and works well. I only shot with it once so far but it was very cool. These are must haves for any amateur or pro phoargopher. I can highly recommend.

Quality seems quite good.

Some of my most talked-about filters were captured with ND filters. The movement of flame and water over long exposure times, shot on a tripod, can be really captivating and not something you can achieve without an ND filter.

I'm using this on a Fujifilm telephoto mostly for video. Image quality is very good with no aberration, relatively easy to screw on/off, hard protective case.

Recommended for anybody looking for a good quality fixed ND filter.

I ordered this lens filter for my husband. He has a Cannon DSLR camera and this filter fits his camera perfectly. He has been able to take better quality photos during the daytime with this filter. It is a really thin filter, but it isn’t flimsy. It is well made, and works as expected. I would recommend this lens filter for beginners and professionals.

Works well.

I have a Canon 85mm f/1.4 that you can't always shoot full open on sunny days without overexposing the image. Having an ND8 filter to knock down the incoming light 3 stops is pretty much perfect to allow you to open up to your widest aperture and shoot.

On my picture above, you can see that the glass for this is pretty good. Ignore the focus (as the left photo was shot as f/1.4, the right at f/4), on my other pictures I cannot tell a difference in image clarity, even when pixel peeping. The two images were shot at 3-stops difference using my aperture and you can see the overall brightness is about the same (keep in mind the f/1.4 vignettes a bit due to my lens)-- so this is a true, ND8 filter. There is some minor color cast, but it's very minimal and Photoshop is happy to auto adjust that out anyways when you start editing your images.

This filter comes in a nice case and the filter is low profile (good new for wide angle lenses) with threads on the front of it if you need to stack another filter.

If this review ended here, I would give it 5 stars. Unfortunately the threads for attaching this filter to your lens are warped or poorly cut. I spent a good 2 minutes each time fiddling with it (spinning it backwards until it seemed like it dropped in, then tightening it, etc.) and it kept trying to cross thread. Once I thought I did have it lined up, it was rather stiff to turn and I don't know that I even got a full rotation out of it. I thought maybe I was just terrible at threading on filters, so I grabbed my B+W filter (brass threads)-- 5 seconds, straight on, tightened all the way, no problem. So I grabbed my Hoya filter (aluminum threads)-- 5 seconds, straight on, threaded all the way, no problem. The problem was not me or my lens, it's this filter.

Maybe 2 stars is a bit harsh, but when you're attaching this to the front of a $2K lens, the last thing you want to worry about it cross threading this , damaging your lens, or worrying about it coming off because it doesn't have full thread engagement. The glass on this filter is top notch, however I wish they would have taken the same care and produced threads with similar quality.

As a photographer, I try really hard to make sure I’m only using gear that is reliable. K&F has done a great job of being a reliable company for budget-friendly camera gear. I have some of their other pieces of equipment and I continue to be impressed by both their dedication to superior build quality and attention to detail in their products. I found that the filter screwed right onto my lens without any issues and I was also able to remove it without any problems. Unfortunately, I wasn't able to capture a long-exposure because I don't live near any waterfalls and at the time when I got this filter, the weather really wasn't cooperating with me much. I did, however, hold the filter up to the lens without screwing it onto the lens so that I could see the difference between the image with the filter and without. With this type of test, you can clearly see a correctly exposed image and one that is darkened quite a bit with showing only the ‘hot’ spots of light in the photo. I did take a few shots with the filter installed and I noticed that there was no edge vignetting issues and because the glass is high-quality, I didn’t notice any ghosting either. All in all, this is a really nice option for a budget-friendly ND lens filter.