The build quality of the filters is pretty good. The rim has a good grip that helps mount/unmount the filter. I have no issue with threading of the filters to put them onto my lenses. Additionally, these filters allow you to stack them. You can mount a filter on top of another. The coating and surface of the filter are even. From pictures taken with those filters on, I don't see dark strips or uneven light. I don't see much of color casting either. Overall, I would say that these are quality filters. I know some of filter kits nowadays have magnet mount mechanism. There are advantages for that. And this one doesn't have that. It doesn't design to be that way. Just need to be aware of this in your selection.

These ND filters are nice. Lightweight, good grip on the metal ring, decent optics, great case.

There might be a slight bit of extra lens flare type stuff going on but i haven't noticed anything that stands out.

This is a nicely manufactured set of three ND (8, 64 & 1000) filters made by K&F that comes in a slip case perfectly suited for protecting the filters in your camera bag. Like other K&F filters that I've bought, the filters are well made, multi-coated glass, and solid frames and threads. Comes with a microfiber cleaning cloth which can be stored in the case. Recommended.

Well made quality filters, with excellent optics, and a sturdy metal frame. The bundle comes with an 8, 64, 1000 ND filters and they look and work excellent, they screw on satisfyingly onto your lens and offer clear optics. The case it comes in also is good enough to take on trips or work.

Very good filters. Great value for money!

Allow long exposures without brightening the photo.

I expected delivery to be better packaged.
The original package was slightly crushed, but luckily everything was good inside. The filters look good, even with the bag.
I tried out the first pictures right away and I can't complain. Nothing that bothers me. You just have to be careful not to screw on the filters too hard, otherwise it will be difficult to get rid of them. It was like that the first time and then it wasn't a problem anymore.

Since I've mainly photographed with variable ND filters so far, I wanted to buy a set with fixed values to have even more leeway. The filters have different dimming levels:

ND8 - corresponds to 3 f-stops
ND64 - corresponds to 6 f-stops
ND1000 - corresponds to 10 f-stops

To calculate the shutter speed, you simply have to multiply the time by the ND number, for example if you have a shutter speed of 1/1000s and want to use an ND64 filter, you get a time of 1/15s.

An example:
1/1000 = 0.001 * 64 = 0.064s
For times less than 1s, you then have to take the reciprocal, i.e.:
1/0.064 = 15.624 i.e. a new shutter speed of around 1/15s

You can calculate this with the calculator, or you can use one of the many apps that calculate the whole thing very easily on your smartphone, you just have to enter the values. Alternatively, you can try things out a bit and after a while you have enough experience that you can roughly estimate it without calculating. Alternatively, you can also find tables on the Internet that you can print out and take with you.

But enough about the theory now. The filters make a very valuable impression. Of course, you can also buy such filters in completely different price ranges and that may be fine for a professional photographer who earns his money with them, but for the normal photographer who does this as a hobby or simply does not shoot in the high-end sector, these filters are great.

They are very flat, which has the advantage that you don't see a vignette in the corners with wide-angle lenses. You can even combine the filters to achieve even longer shutter speeds. Yes, you could combine them even with a variable filter. As a rule, with these 3 filters alone, you can set the correct shutter speed for pretty much all common situations. You can still compensate a bit with aperture and ISO. When combining, you just have to make sure that the filters then apply something to the front of the lens and then you may have to expect vignetting at the ultra wide angle. I tested the filters with my Tamron 28-75m f2.8 and I had no problems with that.

The image quality is very good, especially considering the price. Getting 3 filters for just under 50 euros (at the time of writing this review) is a very good offer. What's more, you get the case in which you can safely transport the 3.

There, the filters are simply pushed into the respective pocket. When taking it out, you just have to be careful not to reach into the glass, otherwise you will have fingerprints on the glass. But with a little mindfulness, this can be avoided.

For me, this is a great set that also gets 5 stars. Of course, I can also recommend a purchase. A good solution for beginners and advanced photographers. Professional photographers usually have their preferred brand and filter models anyway.

K&F Concept ND filter set 58mm ND8+ND64+ND1000 filter, approx. 35€

As an amateur photographer and especially for astrophotography, I of course have a sturdy tripod so that I can take long-term pictures at night, for example with the mount.
So far, I've lacked strong ND filters for the day.

For relatively little money, K&F offers a slim set of 3 in this segment. The three ND8, 64 and 1000 filters are delivered in a foldable bag. The filters can also be easily screwed onto an existing Skylight, the thread dimensions have been kept clean. The package contains 3 wet cleaning wipes.

I did the test with manual adjustments on my Fujifilm X-E2. Set to F22 and set to 1 second in bulb mode using the Rollei remote trigger. As you can see, the first image without an ND filter is completely outshone. ND8 shows at least an outshining sky, at ND1000 it was the end or, as expected, deep night.
It was only the F10 setting and 30 seconds that an image could be seen again.

Of course, I could now also have shot the sea - if one had been nearby - or a stream in long exposure, but with today's sunny weather, wind turbines are a change of pace, aren't they?
:-)

In oblique light, I could not see any optical errors or inclusions on the filters.

Conclusion: I give 5 stars for the money including the filter bag

use in landscapes with fluid movements. Note that I received this product in its broken plastic packaging but no problems with the filter.