This "K&F Concept 77mm True Color Variable Fader" is quite a well designed and constructed filter. It is a "twofer" in so far as it combines both a Neutral Density (ND) and a Circular Polarizing (CPL) filters into one easy to use screw-on device. The build quality is impressive, as have been the majority of K&F filters I've ordered over the last two year. Further, the filter comes packed in a leather case with a pull-out tab to slide the filter out for use.

If forced to find a fault it would only be that I wished the filter went further in its light reducing abillities. Having said that about its ND2 to 32 range, I must also heap praise on the filter for the orange finger putters which allow you to move the filter in gradual amounts instead of only being able to set the filter on full stops. Thus the combination of the CPL function (which cuts out reflections from water or stray light from unwanted directions) together with the ND function (which diminishes the amount of light entering onto the camera's sensor thereby allowing longer exposures) provides the ability to get smooth shots of such things as moving water without suffereing any glare from reflections.

The K&F brand of filters, as a whole and specifically this "K&F Concept 77mm True Color Variable Fader," are well made photographic filters that are true to size and perform their intended effect well. Comparing this filter to similar filters from other makers leaves me with the definite thought that for the cost, fit and effect the K&F filters perform quite well. This filter, specifically, is an impressive filter at a reasonable price and I think it is, if not a spectacular build, definitively better than the average. As such I think that the "K&F Concept 77mm True Color Variable Fader" is unquestionably a strong 4 star product which deserves a place at or near the top of anyone's comparison shopping list.

(Please see below for my rating criteria):

=============================================================

Disclosure:

As noted by Amazon, I am part of the Vine Program which means that I acquire products at no cost in return for a truthful rating. However, although Vine Members pay nothing up front to get these free products they are considered by the Internal Revenue Service as taxable income at the full retail price at the time we get them and we, therefore, must pay taxes on these items.

On a more personal note I often read reviews for products I am considering buying and rely on those reviews that are detailed and come off as honest and full reviews on the product. I therefore try my best to give a true and honest review based on my own experiences with the product.

My Rating Scale:

1 star. This is the absolute lowest I can go and is a definite recommendation against being purchased.
2 stars. Less than average - having issues that I try to delineate in my review. I personally would not pay for this item.
3 stars. Average - neither great nor terrible. It will do the job it is supposed to do but without any obvious good or bad issues.I might or might not buy this item depending on the severity of my need or want.
4 stars. While the product is better than average it is not an excellent product. I would probably buy this product.
5 stars. Enough above average that it exceeds my expectations of how the product would and should perform. A product getting this rating is highly recommended.

Further middle ratings: The above explanation is the base of the recommendations I give in a review. Some ratings are further rated as soft (1/2 star below), solid (the star rating given) or strong (1/2 star above)

Very useful as a CPL and variable nd. Comes in extremely handy for video work and I will continue to use it in the future. The ability to adjust both the nd and CPL in the matter of one small swipe is so useful. K&F continues to deliver an amazing product. Will absolutely be buying more from K&F in the future.

This is a very well made and packaged K&F filter that offers both a circular polarizer and variable neutral density functionality in a single 77mm package. Build and thread quality is top notch. K&F packages their filters so nicely and includes a solid carrying case. Recommended.

I've always stacked my filters. Over the years I've gotten to like using filters and the combo filters have found a home in with all of my other filters. I know many people prefer to add effects with their apps. I love getting my shots that hardly needs editing anything more than just cropping. But I'm still carrying too many filters around with me.
I have enjoyed this filter and I think many other people will too.

This is even better than I was expecting. The filter comes in a really nice box that gives the whole thing a really premium feel. It’s really well-made and works great. I’ve been filming with this for a few weeks now and I’m so happy with the footage I’m getting with this filter. I haven’t noticed any kind of color-cast or anything like that. The footage just looks clean. Also, I like that this is the kind of filter that has hard stops, so you can’t over-rotate it. Highly recommended.

This K&F Concept variable ND filter is actually really amazing. It costs quite a bit less than some of the other big brand filters, yet, it isn't cheap by any means. It reeks of quality, and from what I have seen, appears to be very well made. I noticed while using it my images appeared even more crisp than without it, which I thought interesting. The threads are good, and I had no issues installing this and removing it from my lens. The filter rotates smoothly, and the variable portion really does make a huge difference by allowing you to open up your lens more and create really smooth bokeh. I'm definitely glad I ordered this filter because it has make quite a nice difference in the quality of my images.

I have a number of K&F filters, and I've not been disappointed in any of them. I think K&F uses high quality glass for their filters, and this is preferrable to plastic or cheaper glass. (Yes, in some instances you really can tell the difference.)
This is a combination neutral density and circular polarizing filter. The former cuts down on light entering through the camera lens (nice on really sunny days and a must for longer exposures when photographing things like waterfalls and moving water). The latter cuts down on reflections, allowing you to get better shots when shooting through water (such as rivers and ponds) and glass.
K&F's promo sheets states their lenses are scratch resistant; I can't vouch for that as I really baby all my lenses and filters and I'm not going to intentionally test this.
If you can swing the cost of the K&F Nano-X filters, go for them. They'll last a long time and add minimal to no distortion in your pictures.

The K&F Concept Nano-X True Color ND Filter 49mm Polarizing Filter&ND2-ND32 arrived quickly.

It is very neatly and safely packaged.

The filter is of very good quality. Very high quality materials. Great workmanship.
The settings can be adjusted continuously using the small red handle on the edge.

With its 49mm, it fits exactly on my kit lens. If you have lenses with a larger diameter, you should choose a correspondingly larger filter.
I still have to practice using the filter correctly. But I am already very impressed.

This is a two in one variable ND and circular polarizing filter setup. Very smart setup and avoids having to screw on more filters. Both are variable/adjustable individually with the small handles.

The quality of the glass is exceptional. Highly recommend.

First let's recognize that this filter is very well presented in a beautiful imitation leather case, itself packaged in very neat cardboard.
The filter fits easily onto the lens in my case (Zoom 24/600 on Sony <rx10iv). handling="" this="" filter="" is="" simple="" and="" very="" fluid="" thanks="" to="" the="" two="" lugs="" allowing="" its="" rotation.="" lens="" cap="" also="" fits="" easily="" on="" lens,="" however="" it="" not="" possible="" attach="" hood="" due="" protruding="" lugs.="" results="" are="" spectacular,="" combining="" dual="" action="" of="" nd="" polarizing="" over="" 5="" stops.="" course="" use="" almost="" exclusively="" intended="" for="" outdoor="" in="" particular="" shooting="" an="" aquatic="" environment="" with="" beautiful="" light.="" we="" quickly="" notice="" beautification="" photos="" becoming="" essential.="" without="" being="" cheap,="" price="" remains="" relatively="" affordable="" given="" quality="" compared="" certain="" competitors.<="" td="">
</rx10iv).>