UV filters were essential in film photography, which was sensitive to ultraviolet radiation, but not so in digital photography, where whatever they say, it has no effect (the digital sensors used in today's professional and amateur cameras are NOT sensitive to UV light). In addition, these filters add a layer of glass that can affect image quality if you have lenses that are already of good quality, and can cause unwanted reflections, in some cases even with a sunscreen (since the lens itself can reflect in the filter, so flashes or defined reflections appear in the photo). Whether these filters serve as protection is also somewhat questionable, of course they do not serve as drop protection (if the lens falls head-on on something sharp, the filter and the lens will break). So do they have any use or advantage? However, they do serve as protection from dust and splashes on the front lens, since you can always clean the filter with whatever you have at hand without having to fear abrasions on the lens. It also serves as a surface for other interventions, such as painting with colored markers, adding Vaseline or other materials that give creative effects to our photos without dirtying or damaging the front lens of the lens. The build quality is very good, the anti-reflective coating is also excellent (although not perfect, of course), and it includes a spare lens cap, which is a nice but unnecessary detail as it makes the filter housing excessively large. It is a useful but not essential accessory, whose current price (37.99€) seems completely excessive to me despite the build quality.