This magnetic filter set is ideal for quick access to the most useful filters. Simply screw the magnetic ring onto the lens and the filters stick to the ring.

The ND filter was great on bright days to keep exposure under control. Note that the ND filter is quite intense, which is great for sunny days, but sometimes too dark for cloudy or night shots at certain settings.

It can be easily attached to your camera bag or belt when shooting in bright light.

I ordered this K&F Concept 82mm Variable Fader ND2-32 ND Filter and CPL Circular Polarizing Lens Filter to reduce the number of items I carry with me on a landscape shoot.

When shooting landscapes, a neutral density filter can come in handy. It's the easiest way to create that smooth water effect for waterfalls, rivers, and other moving water. And, a polarizing filter helps to tame reflections that would otherwise detract from your images. This filter from K&F combines these two types of filter into a single screw-on attachment.

I ordered this is the 82mm size (so that it would fit my largest lens) and I'll use step rings for smaller lenses. Operating is pretty easy. You use your fingers to rotate the CPL and you use the attached knows to rotate the variable ND filter. Based on meter readings, you'll get about a 6 stop reduction in exposure when the ND filter is set to max and the CPL is adjusted. With the ND set to minimum, you'll see about a stop and a half or so of exposure reduction.

I did not notice the X pattern that appears so frequently with variable ND filters. However, that tends to happen more with wide angle lenses, and a friend is using mine so I wasn't able to test that out. Color rendition is pretty neutral. I did not notice any reduction in sharpness, nor did I experience significant flaring. Unfortunately, it's not possible to use a lens hood when this filter is attached. Also, you need to know that the front diameter of the filter is greater than the rear diameter. For example, if you order the 82mm version of this filter, your 82mm lens cap will not fit. Instead, you'll need an 86mm lens cap. Be sure to look at the chart in the listing so that you know what specific size of lens cap you'll need for the filter size you purchase.

The K&F Concept K Series 82mm MCUV Pro UV Filter is a must for every photographer. The slim design and high quality construction provide excellent protection for my lenses while minimizing unwanted glare or UV light. The filter's multi-coating ensures excellent image quality with reduced reflections and improved color saturation. With the K&F Concept UV filter, my photos are sharper, clearer and more vibrant. It's a reliable and essential tool that I highly recommend to other photographers.

I think this variable ND filter set is great. Comes with a storage pack. Very easy to attach. I love the magnet attachment. This is so much easier than screwing on each filter. Having stuck with a different brand and type of filter on my lens, this was a welcome change. Great innovation. great quality

Glad I bought this K&F Concept Filter Black Diffusion 1/4 82mm filter, the effect in the videos is very pleasing and cinematic.

These are so easy to use and the quality is fantastic - both the build quality and the picture quality. I can't see any colour cast whatsoever from both the CPL & ND filter. I think you would really need to pixel peep to see any sharpness difference, and even then I'm not sure there is.
Being able to attach the filters to both the UV filter and filter ring is really clever - I keep the UV on my 24-70 F4 and the filter thread ring on 16-35 F4 so it makes it even faster to clip on the filters no matter what lens I use.
Since the ND isn't variable, there's no dark X. And no vignetting at 16mm, unlike when I use my square filter set.

The downsides that I see at the moment:
- You can't replace the filter thread on its own, so if you break or lose it, you have to buy a new set.

I really like the convenience of this magnetic filter system. You only need to thread on the base ring and magnets do the rest. Makes it less likely to damage the threads of your lens if you don't have to keep putting on and removing a filter on every time you need to use it. I am using this with a 24-105mm full-frame lens and the base ring works with the lens cap and the hood although you probably need to remove the hood to snap on the filter because otherwise your fingers get in the way.
Each of the filters themselves are quite a bit heavier than the screw on K&F versions, probably because they need to make the filter ring out of a magnetic steel instead of aluminum. Whatever the reason, they feel a lot more premium than the regular K&F version.
In terms of performance, its a bit of a mixed bag. I don't have tremendous experience using CPL and ND filters (this is my first set) so I don't know what's considered good performance at a given price range.

Moving on, the CPL filter (photos looking out the window) has similar vignette to the ND filter at 24mm but appears to cut down quite a bit of reflections in my windows. Not much for me to point our here, it seems to do the job.
The set does come with a UV filter but I do not intend to use it unless I am in a rainy/dusty environment where my lens needs a bit more protection so I haven't tested it out yet.
For both the ND and the CPL filter, I did not detect any noticeable decrease in sharpness caused by using the filters.
I think the performance of these filters is acceptable. I am a little disappointed with the vignette but I have heard of much more expensive filters having similar issues so I don't want to be too hard on this set. All in all, for someone like me who does this for fun, I think its a great system to learn the basics until I can justify the move to something more premium.

K&F Concept easily adjustable ND filter. The display on the outside shows the area in which the ND filter is set.
The filter can be easily rotated onto the lens because it has a good grip on the outside and is also easy to disassemble.
With the ND filter, long exposures can be carried out very well in daylight.