40.5mm ND4-ND64 (2-6 Stop) Variable ND Filter and CPL Circular Polarizing Filter 2 in 1 with 28 Layers of Anti-reflection Green Film, Two Orange Levers Nano-Xcel Series

Really nice 2 in 1 variable ND and CPL filter. The inclusion of the two putters makes it exceptionally easy to make adjustments one way or the other, depending on what you're adjusting. Turning the filter clockwise changes the density between ND4-64, while turning the filter counterclockwise adjusts the polarizer effect.

I find the 6 stops between ND4 and 64 to provide a very versatile range that works for 99% of the things I'm shooting. The adjustment is smooth, and the density changes evenly and consistently throughout the entire field of view.

The polarizer adds much needed functionality and eliminates the need to stack an additional CPL on to the ND filter.

I experienced no color shift or vignetting while using the filter.

Filter comes with a nice storage case as well.

Overall, excellent performance. RECOMMENDED>

The filter fit my lens well, screwing in smoothly. The lens cap fit on the filter, but the flange on the filter was too large for the lens hood to be used with it. Both the polarizing filter and the ND filter rotated smoothly. The polarizing filter reduced glare when rotated. The ND filter allowed me to slow down the shutter speed and still get the same exposure. This would be great for adding that wispy effect to waterfalls, although there aren’t many waterfalls running here in December. I did notice a purple hue toward the darker end of the ND filter, so apparently it’s possible to go too far with the neutral density filtering. Other than that, I’m happy with the filter and look forward to using it more in the spring.

The K&F Concept Circular Polarizer and Neutral Density Filter offers the convenience of two quality useful filters in one, at a reasonable price.

The neutral density filter provides between 2 to 6 stops of light reduction, more than enough when wanting to slow your shutter speed for video or specific type of photography, like waterfalls.
Similarly, the circular polarizer removes glare and enhances color and contrast.

Although the filter did not come with instructions, using it is easy, and the outer rim of the filter is clearly marked to indicate the amount of light reduction. Turning clockwise changes ND levels, and counter clockwise is the circular polarizer.

The rotation of both the ND filter and circular polarizer is smooth and even, and the frame, which is made of aluminum alloy, is well-machined and screws easily into the lens. Overall, the filter appears very well made and it even comes in a very nice (leather looking) carrying case.

Bottom line, this is a very useful and convenient filter to have in your kit. Content creators of all types, video and photos, will appreciate the ability to reduce light for video and different types of photography, and increase contrast and color vibrancy.

Highly recommended!

This is a really nice design for us landscape photographers. A 5-stop variable neutral density filter with a circular polarizing filter built in. It’s all packaged in a single thin package, made from high-quality glass, that’s also scratch-resistant and waterproof. In the field, it’s easy to work with, very convenient, and no filter stacking is needed. It operates smoothly, just twist to adjust the ND or the CPL. The filter comes in a very nice case and is well-packaged. Overall, a great design that is an excellently constructed tool that should last you a lifetime (barring accidents or abuse).

This is a top of the line combination filter from K&F that combines an ND filter and a circular polarizer. The build quality is excellent. The machining and anodization on the knobs is very good. The selections don't wander but they are pretty easy to move overall. The knurling on the mounting ring makes it easy to get snug enough to not spin off while adjusting the ND/CPL function. Using this filter is a little tricky though and it is not as quick as using the standard filters separately. Moving one ring, tends to move another ring so you need to hold one ring still with a finger once you make a selection, then make the other selection with the other finger. This makes it very hard to use on the go or while holding a fairly heavy lens/camera combination. It is best suited for landscapes/tripod use rather than scenes where the light is changing drastically. It can be set for a scene but changing it takes some work.

Sharpness does not seem to be affected too drastically with the filter on. There is quite a bit of red/purple colorcast though. There is quite a bit of purple/red flair that can happen when used in very bright conditions so take care to be aware of this.

This filter works as a combination filter but will more caveats than using two separate filters. It still situations where both are needed, it works well. I wish they would stick with the plastic case instead of the leather type case they used on this filter. It is bulky and just doesn't stack as well as the plastic cases. The compromises make this an occasional use filter for me but in situations where it is used it has worked well overall.

It is a variable ND filter and polarizer. The CPL filter eliminates light reflections on surfaces, cars, water, glass, and also enhances the colors of the sky, leaves, asphalt, etc. Personally, I use it for video so as not to lose depth of field by closing the aperture (from f9 can I can now go to f2.3 without the images burning due to too much light). About the picture quality. Well, excellent: there are no dominants, no chromatic aberration, no loss of sharpness or the terrible X of Gradual ND filters. I have a very expensive polarizing filter and I hardly notice the difference to this one. Price and performance are great!

A truly excellent product, practical and at the same time very delicate

Out of the gate the first thing you’ll notice is the build quality on this filter. It it feels really solid in your hand, there are no loose parts and has a good weight to it. I like how it has little grip extenders that you can grab a hold of to turn the filter. As the filter does need a little bit of pressure to turn it, it’s nice to have these so your fingers don’t slip. I like how it has hard stops on the ND filter so you don’t accidentally turn it too far, which can mess up your image really quick regardless of what brand filter you’re using.

Fast shipping, works well. The filter is built decently and the quality seems okay too.

The putter on the frame comes in really handy. Honestly, I think that a lot of filters need something like this to make the experience of adjusting the filter much better.

In the past, having to screw on two different type of filters on my camera seemed like a daunting task, and with this filter one of those steps is removed, so I'm grateful for that.

I absolutely recommend this if you're looking to have both an ND filter and a CPL filter in one. It saves you a hassle!