Trying to shoot a long exposure photograph around sunset or sunrise with a standard ND filter can be a challenge. However, with this filter I was able to easily adjust to the changing light condition and keep my shutter speeds where I wanted them to be to ensure that I was able to capture the light trails of the cars in their entirety. The filter did not produce a color cast which is excellent for a filter in this price range. The team at K&F have a winner on their hands with this filter.

Man I love K&N filters! I bought this for my 2013 F150 Ecoboost. The install went better after releasing the factory airbox lid from the intake pipe. I had a K&N oiled filter on my last vehicle for 15 years and the filter was as good as new after several cleanings when I sold the car. I will always have a K&N. I've considered the warnings that over-oiling can cause problems with sensors but I still chose the oiled vs dry. I'm not worried.

I had been meaning to buy a variable ND filter for my 24-70f2.8l for a while. When I heard about K&F filters; having tried a 3xnd filter kit pack that I was impressed with; especially at the price. I looked at K&F's other products and found this more than reasonable price ND filter and had to give it a go.The filter is shipped from China; so its not something to order if you are in a rush - but when it did arrive I was blown away by the quality of the presentation. The filter was packaged inside a well designed; expensive looking, cardboard outer package and then a hard plastic inner with a foam sheet to allow it some protection.On opening the pack one disadvantage to this filter immediately manifested itself; the front element isn't 77mm so your lens cap won't go back on the lens with the filter mounted. The filter mounted smoothly onto my lens. The variable darkness is achieved by rotating the front element; as you would a circular polariser. The K&F filter spun smoothly but with enough resistance to keep the darkness you set so knocking it won't change the setting. One disadvantage to the design is the filter doesn't have coded ND values so there is a bit of guesswork to get the right exposure for stills.I tried the obvious and took an image of a plain white wall at various ND settings; and there was some minor differences in the brightness of the photo - it was a bit lighter at the edges of the frames. At its darkest on long exposures; the 6d went red shift but this is correctable in Lightroom (and made much easier if you use a colour checker passport.) If you zoomed in on the plane white background you could see some variations in darkness; and ultimately pixel peeping at maximum darkness a mesh. That said taking pictures of something more interesting than a wall the effect was lost in the detail of the image.I rarely shoot video so for you dear reviewer; I shot some test video of the same white wall. I don't have any fancy video editing software and just watching the video back in lightroom; the darkening effect was pretty uniform across the photo. As with stills if there were any criticism it is very minor and that the corners show up brighter than the centre of the frame. The majority of the frame being uniformly dark. There was no patterning showing in the video.Using a standard ND filter definitely gave a more even darkness to stills but I am planning 3 long trips this year and carrying 5 ND filters everywhere felt like a chore. Now I just need one. If i could I would ding 1/2 a star for the front element size not being 77mm but its a minor inconvenience in the scheme of things.

The nifty fifty. Great lens for the price! A little bit of vignetting at F1.8, but I actually like it in some photos and don't edit out. Super sharp, and the uv filter it came with is actually glass!

I have recently been checking out K&F and they make a lot of excellent products that don’t break the bank. This filter is good, especially considering the price. I don’t use filters very much, so investing a ludicrous amount isn’t something I will do. This filter does very good at a fraction of the price.

Die Filter von K&F Concept sind immer sehr hochwertig. Einen Graufilter hatte ich bisher noch nicht. Deshalb freue ich mich diesen testen zu dürfen.Schon die Verpackung ist sehr hochwertig und die mitgelieferte Ledertasche ist sehr schön und stabil. Der Filter lässt sich durch das Band ganz einfach heraus ziehen. Die Klappe der Tasche ist magnetisch.Durch den kleinen orangen Griff lässt sich der Filter stufenlos sehr leicht verstellen. Die Wirkung ist erstaunlich. Es hilft in den verschiedensten Lichtsituationen die Belichtung bequem anzupassen. Ich verwende ihn hauptsächlich in Lichtsituationen in denen ich bei offener Blende fotografieren will und das Tageslicht dafür zu stark ist. Die Farben im Bild werden durch den Filter nicht negativ beeinflusst.Toller Filter zu einem ordentlichen Preis. Von mir 5 Sterne.

It worked for slower shutter speed. I couldn't reach 30 seconds exposure in bright day light even with maximum close aperture on Canon 80D. But it worked at 15 sec. And closer to 5-6 pm in summer time, I could set shutter at 30 seconds without overexposure. I wouldn't say that pictures were really sharp through this filter, but where would you use it besides landscapes? I used it in video, works nice when you need your wide open aperture to have cinematic look, however, when I took off filter from Canon 17-55mm, f/2.8 Lens (constant f/2.8), the saturation exploded on video, meaning that ICE filter suppress the colors. You can boost them in post production of course, but color wouldn't be the same as it would go through expensive lenses. Sharpness in video, was actually good. There was not much of focus hunting. As for flare, I used the lens hood, so even with ICE filter screwed over B + W 77mm UV, E Coating, 2 Layers filter I didn't see much of flares, unless you point camera directly against the sun. But as I said not much. I have a Hoya filter on Canon Prime 50mm f/1.8 lens. That one has terrible flare even at night from street light. Anyways. I found that you don't really need 30 seconds exposure for creative picture. I took Monterey Park (California) Ocean waves with 30, 15, 5, 1 and 0.5 seconds exposure at f/2.8 with Canon 17-55mm f/2.8 lens. The best ones were at 0.5 and 1 second. The rest of them made ocean waves and pattern look like a fog in Pirates of the Caribbeans Movie, awaiting for Black Perl to reappear.All in all, it's a good filter to have fun with. Good try out for the price anyway.

Gebruik het filter op Sigma 17-50 mm f2.8; Filter past prima en laat zich plezierig bedienen. Niks mee mis.