K&F Concept 58 mm filter kit with CPL filter. I was interested because he shot professional footage with high-end mobile phones and different accessories. In my case, I make the recordings outdoors and what this filter gives me is the minimization of glare, of reflections. It doesn't eliminate all of them, but it does minimize glass, water and metal. In addition, another side effect it has is that the saturation increases a little, as does the depth of color. It gives a slightly more professional profile, but it's not that it's excessively noticeable either. This is an accessory for people who want to take great care of the image and, well, if you are going to work with landscapes, photos in a river, reflections with glass, it is very useful. However, it can subtract a little bit of light from the lens, so be careful to use it indoors with low light. Regarding the packaging, I really liked the presentation, the case in which we have the filter and I also really liked the fastening system on the mobile phone. These types of accessories are what make the use of these filters democratic, not only on iPhones, but also on other high-end Android phones that do not have specific accessories for them. On the other hand, K&F is recognized worldwide for the quality of its lenses. It doesn't have an exaggerated price, so if you are an image lover and you want to pamper the image a little more, (although this product is nuanced, it doesn't change the product crazy), it simply reduces brightness, increases the saturation a little and gives a little more depth of color. For my part, recommended.