Excelente producto, excelente calidad de construcción.

K&F filters are usually unbeatable in terms of value for money, and this filter is no different. I use it on a Sony 18-105 f/4 and it’s never let me down.

I filtri K&F sono solitamente imbattibili in termini di rapporto qualità-prezzo e questo filtro non è diverso. Lo uso su un Sony 18-105 f/4 e non mi delude mai.

I already have a few filters at home, including the K&F Concept Nano-X ND Filter 77mm Variable Grey Filter ND2-32 for 75 euros, which I use on my wide angle, e.g. in bright sunshine (for open glare shots) and for long exposures, and it's really good.

Now I was able to test the variable ND filter from K&F's PRO series, a filter for just under 280 euros. Of course, if you are already working with filters, you should also use high-quality glass on a high-quality lens, but a filter for just under 280 euros is not a cardboard stick and this investment should be well considered. What I can definitely say is that the filter is at the top not only in terms of price level but also in terms of performance and workmanship.

It starts with the presentation (packaging) of this filter, cleanly finished bag with magnetic lid, suede appliqués, soft and lint-free lined interior, a sideways strap with which the filter is moved upwards by pull.
The filter itself is extremely well made and can also be operated with the two brass noses.
It has a very pleasant resistance when adjusted, not too heavy and not too light.
The glass shows no flaws and the threads are also cut absolutely cleanly.
As for image quality/performance, I can only say: TOP!
There are no color errors/color tint or anything else negative here. I can therefore also work with my lens with an open aperture in bright sunshine and, if I like, take long exposures with the help of the filter with a slightly closed aperture.
As I said, image quality is as good as if I had no filter on my lens at all and that's the way it must be.
The pictures I uploaded (undemanding test shots) were taken with an open aperture and against the sun.

My conclusion about this filter:
Very high-quality processing/error-free picture/excellent feel. Price very high
It is now up to everyone to decide for themselves whether such an investment is an option.

Flexible light control with two handles without changing filters - infinitely variable neutral density filter perfect for reducing the amount of incoming light (1 to 5 stops) without affecting colors and contrast, 8k video recording.

The frame is made of brass material, CNC pattern design, which significantly improves hardness and flexibility, and the installation is smooth and durable, otherwise self-locking frame technology, 1-5 precise light reduction adjustment!

The K&F Concept coating technology gives the filter a very low reflectivity of 0.15%, which ensures good light transmission, reduces stray light and ghosting, prevents glare and does not affect the original lens performance!

Double-sided 36-layer nano coating, waterproof, dirt-proof and scratch-resistant, for excellent filter durability!

The frame adopts an ultra-thin design, 0.01 mm processing accuracy, is very well adjusted and fixed to the lens, so there are no dark corners when attached to wide-angle and telephoto lenses.

The storage bag is made from genuine leather material, purely handmade, specially produced for K&F Concept photographers!

I'm very satisfied

My buddy and I have been running a channel on Youtube for several years and have also become partially self-employed through it. We produce content for companies and we have now put together a lot of equipment for this purpose. When it comes to ND filters, we have been in the cheap segment so far and have relied on fixed filters, as we haven't heard anything good about the cheap variable filters.

We now use square filters with matte boxes for larger productions. But especially for smaller orders, where we need a lot of flexibility, we rely 100% on the Nano-X Pro. This covers exactly the area that we need. The optical quality of the images is really great and there is simply no falsification. In some cases, we also use an adapter for square filters after the Pro ND. This works because the Nano-X Pro has a thread into which you can screw additional filters.

In theory, it is even possible to use it in conjunction with a matte box and a rectangular filter. The options are very varied.

I can only say words of admiration about the workmanship, simply terrific. As soon as I unpack it, I have the feeling that I am holding a super high-quality product in my hands. The workmanship is impeccable and the case makes an equally high-quality impression. The adjustment of the filter is very smooth and the filter has not even tilted so far.

I can make my recommendation without hesitation. Anyone who makes the, admittedly quite large, investment will be rewarded with quality and visual material, which definitely justifies the price. Anyone who claims that a cheap filter does the same in this regard has not yet addressed this issue in detail.

This variable ND filter from the K&F Concept brand was kindly made available to me free of charge as part of the K&F Concept Vine program. First of all, I would like to thank K&F Concept and, of course, the manufacturer.
However, the fact that I received this product free of charge has no effect on my review.

First of all, you have to say that you get an incredibly well-designed product here, which is reflected in the type of packaging. It is very high-quality and attractively designed and gives you the feeling that you have received a quality product here. In particular, the storage bag with magnetic closure is a really nice bonus that you don't often get included in this quality. With a simple strap on the side, the filter can be pushed up from the pocket and removed.
It is also very nice and a nice idea that you can reuse the inlay of the packaging as a small picture frame. A small cardboard sheet is included for folding, on which the quick instructions for folding are also printed directly. This then becomes a small stand, which can be glued directly to the back of the inlay. The small but somewhat stylish picture frame is ready

Graufilter sind in der Fotografie nicht wegzudenken. Ganz besonders in der Landschaftsfotografie nutzt man sie ständig. Man kennt diese tollen Bilder mit dem fließenden Wasser, das so „fluffig“ weich aussieht – Für sowas z.B. braucht man einen Graufilter.

Ein Graufilter, oder auch „ND-Filter“ (Neutraldichte-Filter) schluckt das Licht, so dass man länger belichten kann. Durch diese lange Belichtung und der Bewegung des Wassers sieht es so toll aus.
Durch das Fotografieren mit einem Graufilter wird das auftreffende Licht abgedunkelt und man kann besser in sehr hellen Umgebungen fotografieren.
Wenn man bei heller Umgebung einen Graufilter nutzt, kann man im Gegenzug mit einer weiter geöffneten Blende oder längeren Belichtungszeiten fotografieren.
Durch das Fotografieren mit einer längeren Belichtungszeit kann man schöne Effekte erzielen.
Normalerweise werden Bilder überbelichtet, wenn man eine besonders lange Belichtungszeit wählen.
Mit einem Graufilter kann man dies verhindern und trotz viel Licht mit langer Belichtungszeit fotografieren.
Das hat die Folge, dass Bewegungen unscharf werden und ineinander verfließen.
So kann man zum Beispiel Gewässer oder Wolken, sowie schnell bewegte Objekte besonders kreativ darstellen.

Der K&F Concept Nano-X PRO Serie ND1000 Filter besticht mit hervorragender Qualität, er wird in einem schicken Case geliefert (Magnetverschluss). Dabei ein Reinigungstuch.
Ich habe auf die fünf Bilder geschossen, diese habe ich nummeriert. Der Unterschied ist klar zu erkennen.
Der Filter ist sein Geld wert, er ist einfach aufgeschraubt und sogar mein Objektivschutz passt noch drauf.
Dieser Filter macht Lust auf mehr und bekommt von mir die volle Punktzahl!