I spent a long time buying a filter because on the one hand I didn't know if I needed something like this and on the other hand because I had already tested a 0815 filter with miserable results and the costs for such a part are not insignificant. The question now was whether I should get several filters or a variable filter. In view of the price, the question ultimately became irrelevant. The first tests were able to dispel concerns that the image quality suffers, as with the filter mentioned at the beginning. The images are slightly blurry, but really only marginally. The weakest position extends the exposure time by a little more than 2. In my experiment (Nikon D7200, Sigma 18-35, K&F variable ND filter 77mm ND2-ND400 with adapter ring) I set the aperture to 2 in sunshine. 8 raised to expose well at 1/8000 without a filter. With the filter screwed on in the "MIN" position, the shutter speed went up to 1/3200. I turned the filter from mark to mark and came up with the following shutter speeds calculated by the camera: 1/3200, 1/3200, 1/2500, 1/2500, 1/2000, 1/1250, 1/800, 1/400, 1/125, 1/20(X-Cross, but underexposed). As you can see, hardly anything happens at first and the markings also do not allow any ND value order to be determined, which according to the logic of the first point is 2, the second 4 and the third 8.... So it's time to try it out. In the "MAX" position (1/20) the images are unusable because of the X-Cross, but this is really only the case in the absolute max position, and between the penultimate with 1/125 and Max intermediate positions are also possible where I got useful up to 1/30. So a usable ND value of 266 is calculated. This value is now completely sufficient for filming, because who says that I can't set the shutter speed higher than 1/60, which was the rule of thumb in the early days of analogue filming. Enough theory, I think the filter is an absolutely good investment.
Unscrewing is completely problem-free and if there was a color cast, it was due to the camera (Nikon D7200).
I've uploaded a few pics:
1.) 100% topless bottom view with filter at 5th position (1/2000)
2.) MIN - position
3.) Last usable position
4.) Filter to with X-Cross where the camera with the exposure of my camera (Nikon D7200) failed and I had to raise 2 values ​​in post-processing to be able to recognize something.

Like the title says. Best ND for this price point. In order for you to even see any softness this might cause you’d have to zoom in 300%-500% you’re pixel peeping at that point and if that’s what you are all about then this is not the variable BD for you. Color shift isn’t bad (don’t think you’ll get away from color shift by buying the more expensive brands either) I would highly recommend adding this Variable ND to your kit if you’re a photographer or filmmaker on a budget!

D200, D7100+SMC Takumar 24mm 28mm I tried it in 55mm but I could use it normally. I don't know about other cameras or lenses but for now I'm satisfied. Endurance is unknown, but it is unlikely that this will break her.

Best quality filter I had in a while,

I was in need of a 82 MM PL filter, I wanted some ND filters so when I saw both at a lower price than the PL alone for the name brand I usually buy I was interested. As someone who spent years selling photo equipment of the pro level to pros I want quality. using with two high quality lenses the Nikon 105 1.4 and Nikon 80-400.
Starting with the packaging the box was first rate, not just a cheap white box. The filters came with a case and I was expecting a wallet style, nice but inexpensive and I was please to see a high quality plastic case that provides better protection to the filters. Best designed case of it type I have ever seen, Thin design but thick strong plastic and with a unique rubber grip bonded in to allow filters of any smaller size to be securely held in place.
While the packaging an case are important the real deal is the product itself . When I opened them I didn't immediately identify the PL as it was the same thickness as the ND filters. Most PL are thicker because of the rotating nature of the filter which can be a problem with WA lenses. Thin often equal flimsy but not in this instance the metal rings are of high strength , the filter rotates smoothly and are of good optical quality.
A problem often encounter with PL filters is difficulty removing the filter, especially so with thin filters as pressure to the sides of the filter in removal will cause a filter to be temporaryly out of round and bind. With standard filters you apply pressure with the palm to remove the filter but that is not possible with a PL due to it's rotation. The thinness of the PL makes it difficult to just apply pressure to the sides and they have very thoughtfully made the two rings slightly different, The outer ring , the one you rerun to vary the effect of the PL is smooth, the inner ring has machined finish with narrow grooves that you can easily turn with a fingernail, a great solution . Of course part of easy removal is not to torque it down, it doesn't need to be tight.
Dont frequently review products but his is one I strongly recommend, especially at the value pricing.

I love this 77mm ND filter that fits perfectly with my Nikon 70-200 f2.8. I use step-up rings for other lenses like my 85mm f1.4. The ease of use is phenomenal and it glides so effortlessly. I love this filter. I would recommend it to anyone to push it down to the darkest, open the aperture wide and take a long exposure during the day for amazing results. Enjoy!

Best Tripod out there.

I chose the ND filter with a 77mm pitch to be able to use it with my Nikon lenses and possibly use adapter rings for smaller increments. Well packaged and easy to use. Easily correctable with slight dominants in post production. Very precise packaging that allows you to take it with you in total safety. Equipped with a Frantal ring with the various corrections indicated. Switching from one tier to another is easy and smooth. It can be used in both photography and video and easily achieves good results. We recommend buying specifically for value for money. Ideal for landscape photos and always to have with you.