Exellent filter for the purpose of night sky, wide field Astrophotography. Very adept at cancelling light pollution and has a high quality feel. I can not comment on the coatings, but I had no problems with light refraction or ghosting, and the filter cleans easily. I would say an upgrade from filters like the ICE filters, and the added expense to go to those brands does not justify the cost increase.

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.

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.