A long time ago I started looking for filters for my Canon camera that I now have with a Sigma 17-50 77mm lens. And since I'm not a professional or anything like that, it gave me something to spend some money on filters and then give them more recreational use. So I started looking for cheaper 77mm filters and buying them. In the box you have three filters, a wallet to carry these filters without getting dusty and a brush to clean them. Filter: The first is an ND 4 filter, commonly used for long exposure images. In my use, it gave me good image quality without any unusual hues being too obvious. Nothing that can't be easily fixed with a little color touch up. The second is a polarizing filter, whose intensity varies by rotating the filter itself. This is primarily used outdoors to remove unwanted reflections or add contrast to landscapes. If so, it's pretty dark, so you might as well run the ND filter times. Here we already find a little more vignetting than in the previous filter, perhaps because this one is variable instead of being a fixed filter as in the previous case. The third is the typical ultraviolet filter, which is generally recommended more than anything else to not rub a lens that costs a lot more than the filter itself. Pocket: Okay, it's just functional and what it's used for. The 77mm filters I bought in my suitcase fit easily and feel great. Brushing: Little by little, little by little, it's functional. You have two ends. One end has a silky surface and the other end is more of a regular brush with hair. In conclusion,