The K&F Concept 77mm Variable ND Lens Filter ND3-ND1000 (1.5-10 Stops), Putter Adjustable HD Neutral Density Filter with 28 Multi-Layer Coatings for Camera Lens:

This is a variable neutral density filter of the finest quality with little to no color shift. it covers 10 stops of adjustment and is perfect for video or very shallow depth of field photography. Everything about this filter is top quality. from the packaging to the leather filter holder. There is a Pulltab on the side to eject the filter and a finger nub on the filter itself to rotate the ND adjustment. This is a very fine piece of glass that you don't need to think twice about putting in front of your best lenses. In the past I've had problem with harsh color shift with other vari NDs. So far this seems great. I will report back if I find anything I didn't see in my first impressions. This is a premium vari-ND that I recommend to pro photographers and videographers. Very high quality materials and very well made. Nice glass.

This is a nice filter. I've been very impressed so far with the quality of K&F. It's obvious they work with photographers to get them exactly what they need - not just scientists and marketing experts. It is well thought out and functions beautifully.

I'm not seeing any distortion from the use of this filter.

I see minor color shift (yellow/green). It looks slightly better than my Tiffen viariable of the same power. It is easily neutralized in post production (or through custom white balance).

The knob/handle is fantastic for easily adjusting the ND filter. I really like having the grip. The additional grip is also a nice addition.

The case is attractive and functions well.

I do wish it had a hard "stop" on it for the minimum and maximum settings. It'll keep on spinning around and around. Not a huge deal, but it would be a nice and welcome addition.

Overall, this is a great filter.

This is a really nice filter, definitely worth getting especially if you don't already have any ND filters. I'm using it on the stock lens that came with my Canon M50 and it is very fun to play with. The lens itself looks and feels high quality, and is easy to adjust. The case it comes with is nice but rather large.

Oh my gosh, the putter is such a lifesaver. I've never been a fan of twisting the tiny, super-slim surface of any type of filter. ND filter, CPL filter, diffusion filters, they all lack putters! I'm certainly glad that K&F Concept decided to introduce this into their filters, including this one.

Onto the ND functionality itself, this prevents me from having to increase my shutter speed or aperture. It allows me to maintain a shallow depth of field on my subject even in broad daylight. And yes, it also works for landscape photography and other uses, but my main usage has been for taking video of people.

If you're familiar with the exposure triangle, you may recognize my situation. Reducing my aperture would remove my shallow depth of field, and increasing my shutter speed would make my subjects motion look weird, it would just look very off. There would be no motion blur, and as a result the image looks unnatural in our eyes. So, this ND filter was perfect for fulfilling that need.

Overall, I really do recommend this filter if you're looking at increasing the quality of your videos, and obviously this depends on what you're looking to use it for. If you know that you need an ND filter, don't go with the cheap glass. Go for something like this instead! It'll totally be worth it.

I love the adjustment handle on this filter. I use this on a very wide aperture lens sitting inside of a teleprompter. My previous filter didn’t turn very easily anymore and I needed to use two fingers, which meant taking some of the teleprompter apart to get in there. I also couldn’t do it while in front of the teleprompter to see if I have the right exposure. Enter this filter. I can just stick my finger in and adjust with the little handle, all while in front of the camera checking exposure. It might seem like a little thing, but it saves me a lot of time. What was a 15 minute back and forth is now a couple seconds.

The optics are fantastic. No aberrations or other other optical issues. Very high quality build as well. I recommend this filter.

This filter is great for so many different scenarios. I like how it stops at the min/max settings so you know exactly when you reach them.

These are a must buy for long exposure and any other type of shots your into. The glass is insanely clear, it's even hard to see if the glass is there until you get it in the right light. Overall, you cannot go wrong with K&F.

As with other products from the brand, the KF Concept neutral density filter is manufactured to a high standard and is delivered in a safe and practical case.

Thanks to the special coating of the Nano-X series, there are no unwanted light disturbances in the image when used. In addition, the resistance to scratches increases, which I can really confirm here. Especially when used in nature, I often come into contact with dust, dirt or other obstacles, which, however, have not been able to cause any damage to the filter so far.
The excellent dustproofness and waterproofness of the filter should also be emphasized here!

As expected, the imaging performance of the filter is very good. The aperture levels can be precisely adjusted and are a boon for my 28-75 2.8 lens. This allows longer exposures to be carried out even with open glare and great bokeh can be achieved in bright daylight. Given the sharpness of the image, I couldn't see any differences between images with and without filters. Only in terms of color is there a slight distortion in the direction of warmer shades. But that's nothing that can't be fixed in post-edit.

The filter can also show its strengths in the video sector. Thanks to the continuous adjustment of the aperture levels and the easy and smooth adjustment mechanism, smooth and smooth aperture transitions can be achieved here. This is a great advantage, especially with older cameras!

For such an achievement, every amateur photographer should also be willing to dig a little deeper into their pockets. With this filter, the price of currently around 80€ is definitely worth it! With such filters, it is clear from the outset that the image does not remain undistorted. However, since these changes are really within limits compared to competing products and can be “worked away” afterwards, this is not a point of criticism for me.

So a full 5 stars and a clear purchase recommendation on my part.

This K&F Concept 55mm Variable ND Filter fit my lens fine. It is a well made, quality product. The filter worked as well as some as some of my more expensive filters - very happy with it.

I feel like all adjustable filters should come with a putter like the one that comes with this variable ND filter. I have a few K&F concept ND filters already, but this one is by far my favorite.

As usual, the optical quality of the filter is excellent - there's no color shift, and the tint is even and consistent throughout the frame with no hotspots. The entire range provides a very good spread of stops from 1.5 through 1000.

There's a hard stop at both ends of the putter range to stop you from going beyond the stops. As a result there's no "X" or aberrant pattern. Just crisp, even, density.

Filter threaded onto my lens smoothly and effortlessly. No binding.

The putter is obviously a major selling point, at least for me.

Comes in a nice little storage case that offers plenty of protection for the filter while you're not using it.

Great filter through and through.

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takes nice pictures and its not made with cheap material