Glass filter that comes nicely packaged (leather-like hard case and magnetic closure. It doesn't distort the colors and the 3 steps of EV are correct.

Pros:1) Retains image sharpness2) Warmer color cast (which I prefer)3) Higher contrast than Freewell4) Larger range ND range than Freewell5) Build quality better than Freewell6) Better carrying case than FreewellCons:1) Each ND stop does not have a hard stop or even a numeric indicator so you're not sure if you are on ND 8 or ND 16. This can be a con for some but for my use it is not a big deal as I primarily shoot video and use a monitor to gauge my exposure and just rotate the ND until exposure is correct.2) Filter does not have a hard stop when it reaches 400 ND and you can keep rotating it till you get the X pattern.I'm comparing this filter to Freewell ND mist version since that seems to be the most popular ND filter being used especially in the wedding videographer circles.In terms of overall build quality I want to say the K&F filter definitely feels a lot better. Even the overall packaging makes you feel like you bought a premium product. I really like the rubberized coating they use. It feels very premium and it has a good weight to it. The anodized orange indicator is nice and allows you to adjust the ND stop easily. The case that comes with K&F's filter is much more useable and compact compared to the bulky plastic cases that freewell gives. (There was a time thatfreewell's filters wouldn't even fit their case if you installed the magnetic cap which was a huge oversight on their part although I do wish K&F had a magnetic cap as well since those are the best IMO)I am primarily a video shooter and I was hoping that the filters would have similar color casts but unfortunately they don't. It's not hard to fix this in post but still would have been nice if they did match as I have multiple cameras. I do however prefer K&F's color cast as I tend to like warmer images. I also like the halation on this filter more than I do the freewell. If you look at the image where I put the two side by side the K&F is more contrasty and the light spread is kept where it should be and not across the entire image like how the freewell does it. This looks a lot more natural to my eyes. In terms of sharpness I could not see a distinct difference between the two. Both look excellent.Biggest gripe that I see other people having is the fact that there is no indicators on the filter aside from the first ND2 and ND400. The rest of the stops are indicated by dots. I don't know why manufacturers create an excellent product and then do these kinds of small short cuts. Although for me in real world use this probably wouldn't affect me, it did make testing the two different filters a pain. This is the reason why I have only included one comparison shot because I could only test the ND2 on both filters as that is the only two ranges that are clearly marked on both filters.At the end of the day in spite of some of it's shortcomings the filter does do an excellent job of what it is supposed to do. Cut light without messing with overall image sharpness or colors and give it that nice "cinematic" glow and I honestly think it does it better than Freewell. Thumbs up from me and will be using it at my next paid gig.

Great filter with nice features at a decent price. Got it for around $23. About 3mm thick. Can be screwed on well. hard case. 1 year warranty if you register your product on the website

This very light and compact endoscope camera comes in a hard case with a foam interior. The cable of the camera is about 5 meters long and has a diameter of 0.5 cm. Contrary to what is stated in the description, the camera is not equipped with 6 LEDs, but with 8. 6 LEDs light up on the front of the middle camera. 2 lights on the sides, each on the right and left. Cameras are also installed here. So you can look down (into the combustion chamber of the cylinder, for example) or switch on the camera on the right or left to look at the walls without having to turn the camera. Very good. The camera has a resolution of 1080p, i.e. Full HD, the recordings are stored on the 32 GB memory card supplied and can be called up at any time. The 4.3 inch display is equipped with hardened glass and is easy to read. The menu is tidy and logically structured. The language, resolution of the recordings, etc. can be set here. There are other LEDs on the side of the device that can also be turned on to act as a flashlight. The integrated 2600 mAh battery is charged via USB-C charging cable. A good choice for hobbyists and mechanics.

ordered the Teslong endoscope camera for examining hard-to-reach places. Since I will probably only use it a few times a year, it is perfectly adequate. You can't just compare them to a professional device. It comes in a handy storage case with foam inserts. Operation is clear, self-explanatory and the display is easy to read. The first thing I checked was the drain in the bathroom sink, because hair often gets tangled up in it and clogs it. I have to disassemble and clean the siphon regularly. Now I can inspect the drain with this camera and use the hook to remove any hairballs before they become a problem. After a bit of experimenting with the LED lighting, I got quite good and sharp images, on which you can also see details. The brightness can be adjusted in 6 levels and is completely sufficient. The recordings are stored on a supplied 32GB SD card and can therefore also be viewed later on the PC. The flexibility of the probe hose is pleasant and not too rigid. However, it is difficult to steer, so that it sometimes takes a few tries before you hit the desired position. It can take a while, especially over long distances. The additional lenses are very helpful because you don't have to work with a deflection mirror, as is the case with some competing products. I have no complaints about the processing. There are no sharp edges or burrs.

Impressed with the build quality. Works with a nice clear picture and comes with a nice hard shell case.

The filter is packaged in a small design object. The bag is well thought out from front to back and is just as well designed. But: a lint-free hard case would be much better. Unfortunately that was nothing.

A filter is always a compromise. I put a layer between the object (light) and the lens. As a result, quality is inevitably lost. In this case, the loss is very low, which speaks for the very good quality of the glass. The reflection of the surfaces is visibly reduced.

The ambitious price matches the performance of the filter. However, I don't use the filter bag, but use a hard plastic box - as always.

You can tell right away when unpacking that this filter is of very high quality, because it comes in high-quality hard cardboard packaging. A very stylish and practical case is also included. The filter itself also looks super high-quality, scratch-resistant and works wonderfully!
You can easily screw it onto the lens and rotate it, although it's a bit stiff. But it doesn't slip either!
The price is quite high, but if you are willing to pay that much, you will have an absolute top product!