My choice fell on polar pro or K&F. Well now I know the answer! This filter is beyond my expectations! Build quality is PRO. you will see it once you use this filter on your lens, finally I don't need two separate filters overlapped. As of now, I've stopped buying cheap filters, especially if you have a loan that costs over $1,000. K&F has done a great job on this, and for the price, it's awesome!

I took these test photos at the beach in the late afternoon on a very sunny day. I can see the filter/polarizer has removed any glare from the water, my dog's eyes are so clear with color! Very happy with my purchase

Excellent filter for long exposures! Used with my 16mm 1.4 at Pebble Beach and color worked in Snapseed, overall great value!

I like that it's a variable ND and polarizing filter combined. It makes setting up my shot so much easier, without trying to put in two different filters. On top of that, this filter feels and sounds really solid. Another important thing is that this filter doesn't have the annoying "X" that some others have. I would recommend it and think it would be great for anyone who wants a decent ND and polarizing filter without spending hundreds of dollars.

Good value for money and produces good results.

Great having a variable and ND filter all in one. No colour cast visible. Recommend.

I love that this is a variable ND and a polarizing filter combined. It makes setting up my shot so much easier, no trying to put on two different filters. On top of that, this filter feels and looks really solid. Another important thing is that this filter doesn't have the annoying "X" that some others have. I would recommend this and I think it would be great for anybody wanting a decent ND and polarizing filter without spending hundreds of dollars.

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).

I purchased one of these filters to try it out because I was tired of stacking a fixed ND & a CPL filter.I fell in love with the results & bought 4 more in various filter thread sizes so that all my lenses had one of these CPL+VND filters available without the need for a step up ring.100% worth the investment for both photo & video of automobiles or really anything that would benefit from having this level of control over both your ND & CPL at the same time.I use one of these filters for LITERALLY every single outdoor daytime shot not, EVERY SINGLE ONE WITHOUT FAIL.Can't say enough good things about these filters for my line of work!!!& yes, I paid out of pocket for all the filters, not sponsored.

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 £10 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.