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.

Most of my filters are 82mm in diameter, but I have several lenses with a 77mm filter thread, so I need this adapter for them. It feels good, is very thin and does exactly what I need it to do, so I'm very happy with it.

This is a serious filter. Most of the filters I've used seem to be very cheaply made, but this thing looks like a serious piece of hardware.
I was blown away by how smooth the knob is and how you can actually adjust the filter from light to dark. This is very handy for long exposures, especially during the day. You can't have a long exposure with too much light, but this solves that problem.
The filter does not change the image at all and does not cause any strange side effects. It's crystal clear and just as sharp as if it weren't there.
I also love that you get a padded carry case to keep your new filter safe and the included cleaning cloth is a nice touch.

I'll start by saying that I'm no expert. Most bad reviews are due to people not understanding that these adjustable filters are not meant to be used to their full capacity. Any filter will start to give problems when pushed to its maximum. First, just practice with this filter and know its limitations. You will be a happy customer if you do this.

These filters are wonderful with ideal cinematic qualities. Most importantly, you get a product with superior build quality and looks at a lower price than other brands. HiShop is a very professional organization and I plan to return to this provider in the future.

In contrast to classic ND filters, the intensity of this filter can be adjusted in a range of 2-32. This is done by turning the filter; for this purpose there is a small Nupsi on the filter, which can be used as a 'handle'. Smart.

Supplied with a high-quality case.

The filter doesn't exactly move smoothly. If it were, it would be difficult to set and ideally maintain the desired filter effect. So: there is always something.

The filter is quite bulky overall due to the bonus function. Personally, I wouldn't put on a filter for a single f-stop, it's actually not worth it.
However, I think it's good to remain flexible when setting the effect.

Processing top, color distortion 0. All good.

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!