I bought the K&F Concept magnetic ND2—32 filter for my iPhone 14 Pro Max and am very satisfied overall. The filter does exactly what it should: It reliably reduces incoming light and thus enables significantly better video recordings in daylight — a real advantage, especially for cinematic recordings with a longer exposure time. The magnetic attachment is particularly positive. The filter holds securely to the smartphone, fits snugly on the camera adapter and is still quick to put on and take off. The workmanship looks high-quality, the glass makes a very good impression, and there are no visible color distortions or blurring. The fit for the iPhone 14 Pro Max is also perfect — nothing wobbles or fits crooked. In my opinion, the set is ideal for classic smartphone photography or handheld video shooting. The only downside: The filter and adapter are unfortunately a bit too heavy for my planned use with the DJI Osmo Mobile 7P. As a result, the gimbal reaches its load limit faster and has to balance more strongly. For users who film a lot with smartphone gimbals, the weight should therefore be considered. Conclusion: A high-quality ND filter with a very good mount and strong optical performance. Highly recommended for filmmakers without a gimbal or with stronger stabilizers. A star deduction only due to the weight when using gimbal.