The variable ND filter from K&F Concept comes in a sturdy but quite large zipper pocket, as it also fits the MagSafe adapter for the iPhone 16 Pro Max in addition to the filter. A plastic dust cover and a cleaning cloth are also included, but the cover looks more like packaging material and does not reliably protect against dust. A tight-fitting, tight bag with zipper or Velcro would have been the better solution here. Two boomerang-shaped stickers are also included, whose function remains unclear due to lack of instructions — presumably intended as scratch protection for the iPhone. In use, the filter shows what it can do: As the third variable ND filter in my collection (after two models from well-known manufacturers), it is in no way inferior to the big brands. The adjustable control range with stop is particularly practical — you save yourself the hassle of turning around endlessly in search of the starting point. That is a real plus. On the other hand, I'm missing a lens cap. This may not be an issue for pure iPhone filmmakers, but anyone who, like me, comes up to the required 67 mm with step-up rings urgently needs a suitable cover. Conclusion: The filter is visually and functionally convincing, leaving room for air to rise when it comes to accessories.