I needed a complete kit because until now I only had an old UV filter whose brand I didn't even know, and I wanted to start taking more polished photos by better controlling light and reflections. This K&F Concept pack has exactly what I was looking for: a UV protection filter, a circular polarizer (CPL), and a variable ND filter that ranges from 2 to 400.

The UV filter serves a dual purpose: on the one hand, it physically protects the front element of the lens from potential bumps or scratches, and on the other, it blocks ultraviolet radiation that can cause blue casts or loss of contrast. I leave it on all the time as basic protection. The polarizer is proving incredibly useful for improving my outdoor photos; it eliminates those annoying glares that appear on water or wet surfaces and makes the colors appear richer and more saturated. You just have to rotate it until you find the right angle, and the change is immediate.

The variable ND filter is incredibly practical because with just one filter, you get nine adjustable stops of light reduction. I've mainly used it for recording video with shallow depth of field on very bright days without overexposing, and also for photographing waterfalls with a silky effect during the day. It works perfectly in the intermediate settings, although at the higher settings, a slight color cast or cross-hatching can appear in the corners if using very wide-angle lenses.

The construction is solid, the rings are machined aluminum, and the glass has water- and grease-repellent coatings. They come in a practical case with compartments for each filter. For the price, I consider it a very worthwhile purchase for anyone who wants to improve their photography without breaking the bank.