Fits perfectly to my Sigma lenses. The workmanship is very high quality. I find the padded box that goes with it very practical. The filter can easily keep up with the expensive ones.

Price-performance ratio. Doesn't have a dark "x" like other variable ND filters. Image quality is also very good. Would 100% recommend it. At this price you can't go wrong.

Everything looks good, it's raining today, I can try it against the sun, quality and price are ok

You can get into photography with a variable long exposure at an unbeatable price. Ideal for photographing waterfalls, rivers, the sea, clouds, this filter allows you to smooth the subject. With a single filter you can manage multiple opacities and thus a larger aperture of the lens. All you have to do is rotate the filter and in the end this filter is simply an indispensable accessory for the amateur photographer.

Firstly, I have to say that this is, all in all a good, useful filter and totally worth the price. I'm only taking one star off for some aspects of its performance where I thought it would do better, and another for a problem I fixed myself with a little maintenance, but should really not have been there.As far as stopping light - this filter performs as advertised! It does cause a brownish cast over images at nearly all settings, which can really reduce the vibrance of colours - something you can pretty easily restore in post-processing, but it does mean making that extra step.This filter performs very well for me on lenses between 28mm and around 60mm focal length. Where I was a bit disappointed with it was at longer focal lengths - because with those, it not only mutes the colours, but begins to effect image sharpness, and that is a no-no. Worse, I noticed it doing that a bit unevenly across the image.Closer examination showed that the filter has signs of what seemed like water or oil stains on the inside, between the two glass layers. I ended up taking the filter apart and cleaning the inside surfaces myself - the stains, happily, were not permanent and wiped away neatly after a very light cleaning with ROR liquid. Still, this is something that the filter should not have shipped with and could've been easily quality-controlled.I still find that it doesn't quite perform well on longer lenses - but it's handy on my vintage "nifty fifties". It's just that if I knew I wouldn't be too happy with the filter's performance at longer focal lengths - I would've bought it in a smaller thread size than 72mm.So, my recommendation: if you want an affordable variable ND filter for use on lenses between 28 and 60 mm focal length - go for one that fits your filter thread. Your lens(es) in that range are more likely to be somewhere between 49mm and 58mm, maybe 62mm filter thread. No need to buy a larger 72mm filter for those! And for anything larger/longer - I recommend looking into a higher-quality filter. Even K&F concept actually has some much better ones, albeit for about double the price.

the cross on the ends is pretty strong, more so than with other nd filters I own

I am totally blown away for quality for this price.Great buy

I used this today for the very first time. There was no colour cast. The pictures were sharp, and processed very well in Lightroom. Canon RP and 24-105L.

The filter is pretty amazing for the money.Pros:- inexpensive- durable- doesnt effect image quality- not bulkyCons:-variable ring doesnt stop rotating when reaching lightest and darkest

This filter definitely works as advertised. I researched exhaustively and checked many reviews before purchasing.
Comes in a nice plastic box with some foam cushioning; I added a layer of thin foam in there to keep it from moving around in my bag.
I'm in Florida - took this outside mid-morning, full noon and afternoon, and on an overcast day. Outstanding results, including with flash. On sunniest days I did not crank it up to the maximum setting, just below, and still got great results for both stills and video.
Shooting on a a Canon 6DMII, got three lenses that'll take this 52mm.
Not a 'pro' but half of my income comes from photography and video.
Would definitely recommend this filter - I feel kind of dumb not having gotten it years ago, could have saved many shots.
I found this after seeing the versatility of a variable ND demonstrated in a video, realized I must be missing something. When I looked up that item I was astounded to see that the low-end for that series prices about $250/$300. If you're making museum or some kind of major publishing landscape images you probably don't think twice about that, and I'm certain those pieces are quality. However, if you're reading this then you've already come across a couple of childish and self-important remarks about how this item doesn't compare to 'pro' or 'real' filters. You're on Amazon here - this thing works, give it a try.
Finally - have seen a string of reviews with tantrum-like rants insisting that this filter doesn't work and puts an 'X' on the image.
I'm guessing that's true ... because in the little page that comes with the filter (and the description online) it's clearly stated that turning the filter up to it's highest setting will create this artifact, so they kind of advise you not to do that.
Also, if you cross the street on a red light, you will likely get run over.
It's working for me!