This product is the best value ND filter out there.
-Very little color shift, easy to correct in post or by white balancing camera
-No X or Vignetting when shooting 24mm. It does apparently vignette at lower focal lengths, but I had no issues
-No visible image quality drop that I can see
-Polarizer words great, a must have for increasing saturation and controlling reflections. This was the reason I got this particular filter; the added polarizer was necessary to deepen colors and reduce glare.
-Plenty of stops of ND to shoot video in daylight with f/2.8 in more shadowy areas and f/5.6 everywhere else (shutter 180º and ISO 200).

I cannot recommend this product enough, it works great and I take it with me whenever I shoot now.

The quality of material is really good, the filter made a lot of difference regarding picture quality and it's really worth it.

This filter turned out to be better than I expected.The construction is very solid and the rings turn smoothly.I am very pleased with the results it gives but I would advice caution when using it on ultra wide lenses.All in all another winner from K&F!

This has made life so much easier. A fantastic bit of kit and highly recommended

One of the best purchases of recent times. Works great with my Sony 24mm f/1.4 gimbal. I have no problem with assembly and disassembly. Works well and does not change color.

Great to have a variable filter and an ND filter in one. No color cast visible. Recommend.

I was given this filter by K&F concept to review, but this is my honest review based on using it for a few shoots of both photography and videography. The filter comes in a really nice plastic protective case, also included is a cleaning cloth in a pouch. The cardboard box itself is sturdy with a magnetic opening.I asked for the 77mm filter to fit my biggest lens and got some step up rings so I can use this on all my lenses and by stepping up you wont get vignetting. The filter itself feels very good quality and well built, the exposure adjustment ring allows you to choose between five stops, it feels like a fluid video head and will not move on its own.I didn't witness any colour shift, or any photo or video issues using this filter, also there was no sign of the black X some filters show when the two optics cross at their maximum point.I would definitely recommend this variable ND filter, its at a very good price point and by using step up ring for around you can have this one filter work on all your lenses, that is a lot cheaper than a few sets of ND filters when your lenses have different sized filter threads.Using this on video at either 25 or 30 fps using shutter speeds of 50/1 or 60/1 this filter easily cut down the light to stop my footage being over exposed.I have added a review on YouTube and video demo, you can find this by searching youtube for this product description.

Works great, has smooth action and kills two birds with one stone being able to spin and kill reflections. Only complaint is incompatibility with many lens hoods but oh well, better to reduce diffraction and hit your target than to eliminate diffraction and have to jump through hoops to get a decent shot.

Efficient circular polarization filter and very practical ND filter for long exposures in broad daylight, you can gradually switch from ND2 to ND32 (there are benchmarks to be found out). A very good manufacturing quality. Avoids having multiple filters to take with you. On the other hand, there is some vignetting that needs to be removed with LR, PS or others without any m

I have always been a fan of K&F after buying their tripod, so I was pretty sure about the quality of ND.This is 1of 3 NDs I have purchased for my crew, and I should say this is amazing.I would start with the build quality, and it's pretty sturdy, the casing is aluminum and lightweight.Coming to the colors, I didn't see any difference in colors with ND on at Min and ND off. Also, the cutting down of light from ND 2 to ND 32 is so accurate for an ND(measured with exposure meter).