This filter is doing its job perfectly. It catchs night light pollution so I could take clear night sky. I've tried it at Josua tree national park to capture Neowise comet, and it worked perfectly.

I have used ND grad filters for years on my SLR and DSLR cameras. I love scenery photography as opposed to portrait so always looking to sort out the difference in the light between the horizon etc. I live near the sea les that 300m away and walk along the cliffs regularly and don't take my DSLR with me when walking the dogs but always have my iPhone so any unexpected scenes are normally captured using the iPhone. This ND grad filter will come in useful. It fits over the lenses of my iPhone and helps sort out the difference in the light. Once clipped on it is easy to rotate the bezel to the setting you want using your finger. You have to ensure that you do not go past each of the stops or you will get leakage. SO my advise is to check before shooting that you are at the required stop. The other great thing about this filter is that it unscrews from the clip holder and can be screwed onto my 52mm lenses..Bonus... All in all this is a great little filter that I will carry around with me when out walking the dogs. We have a dog walking bag which has Poo Bags and drinking water etc so it sits in the side pocket of the bag in its case. so it is always there if we get a lovely sunset or something really nice to photograph on the sea or beach.. Get little gadget well worth the money highly recommended... As soon as we get anything really nice I will update this with the images...

Shooting in the city always undermines the results because of light pollution. But even in Bolter meter 4 light bollution I was able to use this filter get the desired effects I wanted in my photos. As a novice astrophotography I recommend.

Construction is very good with rubberized edge ridges for easy installation and removal, especially important for a filter that will only be used for night sky photography. Light transmission is good with no apparent chromatic aberration from edge to edge. The filter doesn't easily attract dust and cleans well with a quality microfiber cloth. While I've only taken a few night test shots, the filter appears to be very effective, especially for sodium vapor light pollution. One more item of note - the filter case is the best I've ever received with a filter of any price!

It eliminates light pollution quite a bit, and it slows down light by half a step. There is a bit of magenta that can easily be removed in editing.

I liked everything about the price

So, let's start by saying what these filters DO NOT do (any, any brand). These filters do not remove light pollution. If that were the case, you could photograph the Milky Way from the center of Rome or Milan, and of course that's not possible. Light pollution, if there is, cannot be removed in any way. So what do these filters do? The street lamps of the cities almost all give a light on the dark orange, which gives the landscape and the sky an annoying dominance. These filters do nothing but CONTROBALANCE this dominant with a colder color and as a result you have photographs with dominant orange much less marked and with blue skies. This is what makes these filters and in this case it does quite well.

It reduces light pollution in certain scenarios where light pollution is low, but near cities or near urban environments, although several youtubers dedicated to the world of photography say that in the latter environments it greatly reduces become. It is solid and of good quality, it fits perfectly in the Nisi filter holder.