Great lens filter at a good price. I didn't notice any blue tint or reduced image quality.

The UV filter has a high-quality and clean finish. I really like the blue-purple reflection and it really makes a difference. I didn't notice any changes in image quality, but there could be a slightly different, increased lens flare. If you like the look, you will be satisfied with the filter. In any case, I can recommend it as protection for the lens!

small disclaimer: I'm not an ND1000 filter person, I find their water/cloud smoothing effect mostly unnecessary and overdone, overused and overpowered (and many more overs). I said that I need a little more than ND64 every now and then, so I decided to give this KF a try, especially since it came in at 40 EUR with a Black Friday discount. I didn't expect miracles and was prepared for severe color casts. It turned out better than I expected. With this filter there are obvious color casts (photo 1) and to all the claims of "I don't see any cast" all I can say is turn off the AWB please how else can you talk about color casts seriously?! but with the WB adjustment it corrects (photo 2) very close to original colors without this ND1000 (photo 3). Correction scale: 5000K->7200K and 0->+35 magenta in Lightroom. As expected, the sharpness for a wide-angle lens (35 mm) is perfectly fine. I do notice more vignetting (both lenses have the same degree of lens correction), which I'm not sure how to explain, but I personally don't mind, some in landscape shots. Overall I'm pretty happy. It's a cheap alternative to brands already known for heavy blue casts (love your ND graduates, Lee, but your Big Stopper is pure and simple a blue filter, period) and for casual use, you really can't do more expect

UV filters in the digital age only make sense to a limited extent. I mainly use this type of filter as a protective glass for the lens, so that I don't have to worry about damaging the lens even on the beach or during somewhat hectic photo shoots. The protective function is achieved very well with this filter. The processing is good, the glass is clear and without inclusions. The filter edge is thin enough that there is no vignetting. The blue coating is a bit annoying. If the sun hits the filter unfavorably from the side, a blue shimmer is produced on the photos. Of course that shouldn't be the case. However, this phenomenon only occurs at very specific angles to the sun. But the value for money is good, so ⭐️⭐️⭐️⭐️

The filter is really good, it seems to be a real 10 stop filter (some ND1000 are only 8-9 stops, which makes shutterspeed calculations hard), it is reducing light in both Visible and Infrared light (has been tested on a full spectrum camera used for Infrared Photography), so you will not have a nasty discolouration in the sky as with other ND filters, but you will get a slight blue colour cast, nothing that can not be fixed in post process with the white balance tool, but I highly recommend doing a white balance setting with the filter on to get accurate colours, especially if you are shooting in JPG. I did not see any reduction in detail (see the 100% or 1:1 crop). It easily screwed on my lens and step up rings as well. It has a nice grippy area which I find giving a much better grip than other filters. One thing I'd like to mention is the case it's coming with has a nice locking mechanism and also two carve outs to be able to easily remove the filter from it's case, actually it's one of the best cases I've seen, beating the nice metallic cases from Gobe, which does not close well with larger filters.
If colour cast is a critical issue for you then this filter might disappoint you with it's blue cast, in that case I recommend Haida's NanoPRO ND1000, which I unfortantely lost, but that has virtually no colour cast at all, but nearly triple the price.

The filter quality seems to be perfect. I'm used to that from K&F Concept. And you get a really nice blue streak effect. The problem, however, is that you get that with every single light source in your image, so you don't really have the ability to be selective. You have to compose your recording really carefully. The filter rotates smoothly, allowing you to change the direction of the stripes, but you'll still see them in any light source. I think in the end Photoshop is probably the better option to give you more control over such effects. Still, it's a worthwhile tool to have in your toolbox, especially given the cheap price for an FX filter. It uses the same high quality optical glass as the other newer filters. The precision machining of the filter threads and ring is impressive and gives the feel of a much more expensive filter. So I can't fault any of the properties of the filter. It's just for the way I shoot, it probably won't be as useful as for some other types of photography.

Very good 77mm blue streak filter. The blue steaks can be rotated 360 degrees, which means you can point the light spots in any direction you want to create some very interesting effects. The images I've added are an example and were taken in the same spot I just rotated the filter to show how it works. So far I haven't had any issues with removing the lens filter that you can get with a rotating filter. I'll admit I didn't quite understand how this would work and tried using it during the day on a cloudy day and obviously didn't get anything, but I can confirm that this filter does the pictures I took has not affected, so you can put it on your lens and as long as there are no lights, everything is fine. For this to work you will need a light source, street lights, car headlights, wall lights, etc. BUT note that you cannot choose the light source. So if you have multiple lights you will get the flare effect on all the lights. I tried this on an 85mm lens and with the lens filter on I was still able to attach and detach the lens hood as normal. The filter doesn't have an overhang on the lens, but that probably depends on the lens you're using. Overall I am very happy with the Blue Streak Filter and would recommend it to anyone wanting this effect.

had fun playing with this Blue Streak filter. It creates blue stripes on your subject or, depending on the setting, light stripes. I enjoy capturing unique shots with the camera and this one is really great. It rotates 360 degrees on your lens, allowing you to rotate the strips in any direction. I have always been satisfied with products from the K&F Concept brand. The filter was clean and ready to use, which is a rare treat. It also comes with a durable carry case and microfiber cloth. Very happy with this filter.