There are filters with infinitely variable adjustment options. They're good, no question about it. But if you want to reproduce very specific - exact - settings, an ND filter with latches is better suited. Because if you've made a recording with a specific ND set, you can make all kinds of other settings, but when you need it, you can easily have the same desired setting. Exactly the same one! I can therefore recommend the filter - regardless of whether you are a professional or an interested amateur.

This is definitely a step up improvement in filters for me, and I love what this filter can do. It only has 5 stops, but seems to handle most anything I need to photograph on my outings. A trusted brand that doesn’t disappoint. The lens and housing is gorgeous and this comes with a first rate leather magnetic case. Five stars!

I love these variable ND filters. Although they have clear optical disadvantages compared to fixed ND filters, the advantage lies in their literal variability.
With “fixed” ND filters, you always have to bring a whole set of filters with you.
That costs space, weight and is, of course, more expensive. Switching or making the right selection on site is also complex.

With a variable filter, you don't have these problems. Simply screw on one filter, turn it until you have the desired darkening, and you're done.

You have to buy this advantage with slight losses in imaging performance.
Since such filters in principle “only” move two polarizing filters in opposite directions, there are slight inaccuracies in the evenness of the darkening.
However, this can be corrected relatively easily in post-processing.

Otherwise, there are no weaknesses, not in any case that I could identify them - as a layman.
For me, the benefits and ease of use clearly outweigh this.

Thanks to the “handle”, it is actually very easy to use. The resistance is also right, so that the desired value is not so easy to adjust by itself.

Everything is fine here, even the price is right when you look at comparable products.

I give it five stars!

Use the 72mm version on a Sigma SD 14, fits perfectly and saves me many different darkening filters. A really great thing, I didn't even know that something like that existed. I used to have 4 different neutral density filters, which I could now put all of them out of my pocket. Sounds like a lot of money at first, but I only calculate the expenses of my 4 filters against it... oh oh I would have been much better off here. Now I can! infinitely variable! adapt to all lighting conditions, a dream come true.

I am not bragging to everyone that I got this ND filter - I am celebrating. This has by far the most exquisite packaging, the most classy case within the box - full leather, with magnet closure, and a stunning color choice on everything - including the eye-catching knob/catch that assists the turn. Also the filter comes to a complete stop so that you don't risk the "x" twist of the filter. Phenomenal design. Love this. Can't wait to put it to good use!

Delivery was very fast. The filter is well made. Instantly screwed on the optics and tried it out. Make its darkening without an X image, as a stroke from min to max. Color image is almost without color cast and is very close to that if it were without a filter. TOP. The only thing you can complain about (it's probably heavy from various optics and their threads) is that the control lever does not point upwards when screwed on. It also works without the lever. The autom. Focus, as with my Sony AX100 camera, can sometimes be lost when set to dark.
Still, I highly recommend K&F, even though it costs more than most. Cheap filters can't keep up with that at all.

In order to be able to capture colors more realistically and in more detail, you have to increase the shutter speed a bit without overexposing the images.
With the K&F Concept ND filter, the brightness can be reduced very easily and in a very short time.
The 58 mm version is ideal for screwing onto Canon lenses. It is a pity, however, that the cap for the lens no longer really fits.
At the slightest darkening, the adjustment lever is at the bottom right and is pushed upwards, at the highest darkening, it points right up, which is very easy for me as a right-handed person to use.
I think the results speak for themselves. I'm still a long way from being a professional, but it allows you to capture and capture really intense colors. For almost beginners like me, who likes to try out everything possible, the filter is great to use and absolutely great for sunsets here on the Baltic Sea beach (but of course also where there is no beach).
The included case for the filter rounds off the package really nicely. It is therefore well protected whenever it is not mounted on the lens and with the pull strap, it is also elegant and easy to unpack from the case. The leather case has a hidden magnetic closure, so the filter will definitely not fall out of the case unintentionally.
Overall, a great filter that, with its results, makes you want to move on to the next, stronger levels.

The filter can be selected directly for a lens or used with adapter rings. I chose the former because I don't find the constant changing ideal and I only need the filter of this type for one lens. With this variable filter, you can cover several f-stops. I'm happy with the quality. The material looks high-quality, the thread is precise and I also find the glass excellent.
The product fits the description, I am satisfied with the quality and can recommend this variable ND filter.

The K&F Concept filter arrives safely packaged here. A dust cloth and a storage bag are included.

The workmanship of the filter is really first-class. High-quality materials, great handling, perfect shape and not too heavy on the lens or in the hand.

The filter is simply attached to the lens using a rotating mechanism.

The filter conjures up wonderful images that you no longer have to rework.

The price is certainly a deterrent for now - but in my opinion, this is one of the best filters on the market. Professionals MUST strike, amateur photographers CAN strike without hesitation

Quality: +++++
Workmanship: +++++
Compactness/Size: +++++
Application: +++++
Glass quality: +++++
Stability/Robust: +++++
Flexibility: +++++
Functionality: +++++
Perfect fit: +++++
Price/Performance: ++++

This screw-on filter ensures that you can reduce the light for taking photos. This results in a longer exposure time, which can be used well for certain situations.
We have now tested this filter a few times and so far we are quite satisfied with the results achieved.
It does or should achieve what the filter does or should achieve. This makes it easy to blur or let waterfalls, streams or moving clouds flow. Or you can also use such a filter quite well here in areas that are very busy with people. With a long exposure, you can easily make people disappear from the photos who are in motion.
But you can definitely recommend it. Nice effects, no color changes visible (bluish, purple, etc.).

The K&F Concept coating technology gives the filter a very low reflectivity, which ensures good light transmission, reduces stray light and ghosting, prevents glare and does not affect the original lens performance.
A really well made filter.
The nano coating is waterproof, dirt-proof and scratch-resistant and therefore ensures excellent durability of the filter.

The workmanship, design and quality look very high-quality and very well made, and the filter glass texture also makes an extremely positive, scratch-free impression.
The variable ND filter reduces light by up to f-stops, meaning ND2-32 (1-5 stop), which causes no color cast and no loss of image quality.
On the subject of autofocus and filters:
The autofocus continues to work well with the Sony A7 Mark 2 or the Sony 6500 combined with various lenses, although this decreases a bit. Here you simply have to switch to manual focus.

Overall, a really well-made filter, with the advantage that it is easy to install compared to rectangular filters, which require a rectangular filter attachment.
This filter arrives in a neatly made box, in which it can be stored safely and well.
So far, this filter has convinced us without any objections, so it is a clear recommendation.

We put a lot of effort into writing our reviews and invest a lot of time. In doing so, we address positive as well as negative aspects of the product in order to clarify everything before buying. Who likes bad surprises? So not us. Therefore, we hope that our review was useful and was able to help. Let us know Thank you in advance... Best
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