I've used it once and I paired it with a 10 stop ND filter with this and I was able to set my camera set at 30 seconds, f11 and ISO 50 in the middle of the day but with the 10 stop I could only get it to 10 seconds, f11, ISO 50. I was surprised to see that when I got home to edit the photos there was no noticeable loss in sharpness with both ND filters on and this being a variable ND filter they're notoriously known to be less sharp than a constant ND filter. I can't wait to test this out on a waterfall but being that it's summer in San Diego right now I'll have to wait to try it out but along the coast I prefer the 10 stop ND filter and being able to drag that shutter longer. The front of this variable ND filter is quite large so your lens hood won't fit on there which can be an issue with unwanted lens flares but the K&F 10 stop ND filter I used with this you're able to mount the lens hood still. I received this filter free of charge to test it out so take my review with a grain of salt but if you do choose to get this I highly recommend getting a 10 stop as well because you'll be limited to 2-3 second shutter speeds with this alone at it's darkest setting in the middle of the day where the sun is bright like it is here in Southern California. I forgot to mention that there are notches on the side and tells you the minimum - maximum darkness and each stop between so there isn't any guess work involved but I do like the fact that I was able to set my settings I wanted and just rotated the front element until my camera read that I was properly exposed.

So far so good. I have to actually take it out and try it out for long exposures. I filmed with it the other day and it was pretty solid.
Will update if more positive or negative.

Great quality for a decent price

Considering this is my first time ever purchasing a neutral density piece of glass here are a fee things to consider, This is probably one of the smallest rings that you’re going to get So based on my experience I wish I would have bought a much bigger in the filter with a step up adapter ring. The product itself to me is excellent although I have nothing else to compare it to. However, I know that I don’t see a difference in chromatic aberration’s or focus. I do see a tremendous difference in my pictures outdoors mid day now that I can use a lower stops I can get this creamy Bokeh look with out it being dark outside.

I tested the filter for the first time this year for three weeks in Berchtesgadener Land. For the ideal companion on the go, which neither takes up too much space in the backpack nor in the small, light bag. In terms of quality, it does not completely replace the large filter systems, but whoever is already with "hobby equipment" or, like me, is out and about with somewhat older equipment, can be more than satisfied with the quality. And: it takes up significantly less space. I think it's great that the filter can be continuously adjusted. The same applies to the scope that the filter covers. However, I would have liked numbers for the markings and not just squares. That would allow a little more planning and calculation and a little less trial and error at the beginning. But over time you know the values ​​after all.

As soon as I added this lens filter to my lens I was ready to film in the sun.
That's what I got it for. To use a F1.4 lens in daylight.
Doesn't compromise camera quality when filming either

Fraction of the cost of a complete ND system. The craftsmanship is incredible. I own the 72mm and 58mm filters.

This filter works well with several of my Canon lenses. It feels very well made and I am confident that it is added protection for my lens glass as well. I appreciate it comes with a sturdy case that can be used when not on my lenses.

With this filter you can achieve cinematic footage due to the ability of being able to keep your shuttle speed down. This lens is amazing! A must have for anyone serious about getting high quality footage.

love it the quality the easy use everything is perfect