I'm really happy that this filter can be screwed onto my Nikkor Z 24-70 f/4 S with the lens hood in place. Obviously I need to reach into the lens hood to adjust the filter, but that's ok. No vignetting that I can see.The filter works great, nice smooth action and a great range of density.

This is a must have item in your camera bag and for a fraction of the cost of other brands of Variable ND filters.So far I have tested it with several lenses and 3 different cameras using step down rings in low light and bright mid day light from the lowers ND2 all the way up to DN32 and so far have not seen any X pattern. A huge issue with many a variable ND filter, even with the really expensive ones.Color cast is insignificant too, but like ALL lower end ND filters there will be a color cast, hell even a $500 one will have some kind of color cast, again at a fraction of the cost to have a barely noticeable color cast, or at least one that can't be easily corrected in LRThe only real issue with this is if you are using the filter with the same thread size as your lens the vignetting is a little bad at both extremes, unless you zoom in with your lens. SO I bought the 77mm one for my old Canon 24-105 that has a 77mm thread on a full framed camera, and at the extremes of the ND filter and when my lens is at it's wider focal lengths the vignette is somewhat an issue, again a vignette is still easier to work with than the dreaded X pattern.Now adays I am shooting with Sony mirrorless and every lens I shoot with on my full framed camera is less than 77mm threading and the vignetting is no longer an issue at any range of the filter and at any focal length of the lens and I have been shooting the dang thing A LOT with my Sony.Crop sensor cameras should not have the vignetting issues with this filter.Above are some of the photos I have taken with the filter including my Canon 5D series and my Sony A7R series. The first 3 are of my Canon and the second 3 are my Sony

It took only 22 days to reach my doorstep in India. The product feels outstanding and my experience was 10/10. Fully satisfied.

I really like this filter. I've been using since November and have had pretty good luck. I can stop down and get some great shots. I was using the filter today and noticed that it's dirty in-between the 2 filter glass. Is there any way to separate the piece without breaking it to clean that? That's the only issue I have. Would love to know. Otherwise, great product. Love it! Thanks.

Images and video look even and no color distortion

This filter is great, feels well built, and comes with a sturdy and protective case. I noticed very little color shifting for video work and the range of ND is good.

Bought and used on my trip to Hawaii. Good quality, no issues, super clear photos using it on my tripod.

Great filter . Using this on my Zeiss 16-35 f/4 on a Sony a6500 for film use. The picture and build quality of the filter is good value for money , made with quality glass . My only complaint and this is pretty big deal for me is my lens hood will not fit while using this filter . It’s one or the other for me now , which is a bummer.

I find that the picture quality is awesome, but for some reason, this filter is SUPER DIFFICULT to screw onto any of my lenses or step-up rings. It's the right size and after struggling for up to a couple of minutes to line up the threads perfectly to screw the darned thing on. Once it starts going on (I've confirmed that I'm not cross-threading it) it's super tight. Idk if I got a dud, but it's crazy how difficult it is to screw on and that's incredibly frustrating in the moment! It'll never fall off from twisting the adjustment ring, on the bright side.

I had use a few ND filter but all make the image very soft, but this one is great !With this K&F Concept I get very sharp image in all range from ND2 to N32, also no black corners.I have use this 77mm with a 67 mm lens with an adapter and work great.I really like this filter for the price and also like the its carrying case which is nice made and protective.