Fits perfectly

I can only recommend it to every photographer and especially filmmaker!

I am a self-employed filmmaker and usually work with relatively expensive ND filter systems or have a built-in ND filter in my Sony Fx6, for example. But I needed an external solution for my Sony A 7 IV. Before I buy systems from Tilta or similar for 500 - 1000€, I wanted to try out the K&F solution at least once and that was the right decision. Works very finely at removing light. The filter wheel is also easy to operate, so you can also adjust the filter on a gimbal. Great!

I have had many filter systems. From very expensive to really cheap. This filter is priced rather lower, but the quality is high! I'm really excited and have made the filter an integral part of my equipment

For my standard zoom I wanted to buy a variable ND filter and came across the K&F filter. As usual, it arrived well packaged and quickly. A transport box is included. The filter has levels 8 to 2000 and covers a very large area. I immediately tried the filter on my Olympus OMD EM1 MkII, it works great. I could not detect strong vignetting or noticeable color casts. With maximum darkening, one should pay a little attention to segmenting patterns (light-dark). Of course, the K&F filter cannot keep up with large filter systems, but that was not a selection criterion for me and such systems cost a lot more. The price-performance ratio is great here!

The set is the perfect introduction to the world of filter systems! If you want to try your hand at landscape photography or if you only do landscape photography "from time to time", you won't be able to avoid the set. It is solidly built and even a stay of several weeks on the beach could not harm the filter, the mount or the adapter rings.

Since I don't want to own (or pay for) several round filter systems, such adapter rings are indispensable. The K&F Concept model is of good quality at a fair price. There is nothing to complain about here.

Works as you would expect from a polarizing filter.Of course it can be difficult to find the right angle, as once in the air there is no way to adjust it. And on the ground, there may only be a limited possibility of finding the optimal setting in advance. That's to be expected from a circular polarization filter, and unless you can find a motorized, remote-controlled filter, it's unavoidable. Two lines each on the rotating part and the frame should make it easier to readjust the angle relative to the previously tried one. That helps a bit, but not much. With shots directly downwards, you can of course rotate the entire drone. The filter always has a very slight ND effect, such as ND2. Like all Air 2S filters I've seen so far, it cannot be combined with others.

I originally bought this UV filter for my Air 2S drone to protect the camera lens from dust and dirt caused by flying the drone. The drone itself comes with just a rim frame with no lens for the camera. Right off the bat, this item feels well made. In that sense, I'm new to camera drones and filters. Just buckle up and do what it says. I live by a lake and fly over it all the time. This is from the other night with a longer exposure. Works as advertised.