Works perfectly on Sigma 24-70, used it in different daylight situations, works perfectly. The Polarizing filter is an extra benefit!

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):

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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)

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.

The cpl filter adjustment moves when you try to set the nd filter unless you hold it with your hand while rotating the other ring.

I was pleasantly surprised by the quality of this Variable ND/CPL filter! I've used a variety of screw-on VNDs in the past with mixed results, typically I would be disappointed by color casting, sharpness decrease, and/or the X-shaped vignettes that accompany VNDs. Surprisingly, the only negative artifact this VND filter showed was a bit of vignetting due to the CPL, but that's hard to avoid with any VND/CPL combination. Overall, here are my thoughts:

Pros:
- Maintains sharpness of images
- Maintains color temperature of images
- Premium build quality
- Easy-to-operate design with the aesthetic orange tab for rotating through the VND range

Cons:
- Vignetting can be noticed in the sky at high VND levels

At the moment, this might be my favorite screw-on, lightweight, "throw it in the bag" VND filter. Would definitely recommend.

Cons:

How awesome that they have combined a VND with a CPL in one filter here. How often will a photographer use both a CPL and VND shooting beach / water scenes on a bright, sunny day? Um, only all the time! I simply can't gush enough about how useful this is to have both in one filter.

I got it in 82mm to fit my Canon 24-70 f2.8 II, which has an 82mm filter ring. The threads are cleanly machined, and it works very well on this lens, and with the VND / CPL combo, I can actually shoot at f2.8 sometimes. That's pretty impressive on a bright sunny day. And even get a little motion blur. This filter is worth every penny they're asking. 5 stars.

I originally ordered a different filter that wasn't this "True Color" version, and it really threw the overall white balance off on my camera. I found myself trying to change a lot of colors to get it to look just right, but THIS true color ND filter was PERFECT! It was crystal clear and made my colors pop. I took it on a trip to Costa Rica for the last few weeks and the 1-5 stops were absolutely perfect. Whether I was filming our hikes in the jungle and experienced lower-light conditions, or whether I was filming surfing at the beach, I never needed to go any darker. I can't think of a better word than "Perfect" to describe this filter. I also love the little orange dials, they make it so easy to control. Sure, if you're constantly adjusting the outer ring for the normal ND adjustment, the polarizing ring also moves a little with it, but it's not really an issue I had any problem with. Love this.

Nice filter. Tested on a Canon 24-105 L lens. Lens cap fits fine, but the hood is a no go-either before or after applying the filter. Easy to use, good damping on the adjustments, stay where you put them, threaded on as good or better than any filter I've used. Biggest issue for me is having this with me when I need it. I expect this was designed by a waterfall guy. Can’t wait to try it when the weather breaks and I can finally get out to one. I had the best experience using a CPL when I was at Yosemite. Don't go there without one. This combo will be just the ticket when I return.

This is really cool, I used to carry some ND filters and a polarized filter, but now I got both in one unit

The adjustments are easy to make independently, but you may need to hold the ring.

The finish is good, very professional look.