Choose it based on mounting style, density type, and your intended use. For the iPhone 15 Pro, you'll typically decide between clip-on or magnetic mounts, and between fixed-density filters and flexible options. Consider your shooting conditions (bright sun, reflections, or long-exposure needs) and whether you want added polarization or graduated effects. Finally, verify compatibility with your phone case and ensure the filter aligns with the main camera lens for clean results.

Density (measured in stops) is the key factor. It controls how much light reaches the sensor and thus dictates exposure and motion in the scene. A lower-density filter preserves detail in bright conditions with minimal impact, while a higher-density filter enables longer exposures for silky water or dramatic skies, and requires adjusting shutter speed accordingly. For video, balance the density with frame rate to maintain natural motion without harsh flicker or stuttering.

Beginners typically start with a clip-on ND filter of moderate density to prevent overexposure in sunny landscapes and keep editing simple. Professionals often select higher densities or add a polarizing element to reduce glare and achieve longer exposures for water, clouds, or motion-rich scenes. They plan shots around lighting and frame rate, choosing a setup that preserves natural color and detail. In both cases, match the filter format to the iPhone 15 Pro’s camera arrangement and your case compatibility.

Mount the filter securely so it stays aligned with the main lens on your iPhone 15 Pro, and remove it before storing. Keep both the camera lens and filter surfaces clean with a microfiber cloth to avoid smudges that degrade image quality. Check that your case does not push the filter out of alignment, and avoid stacking filters or using ill-fitting accessories. Store filters in a protective pouch to prevent scratches and dust.

Look for reputable brands that offer smartphone-specific ND filters in clip-on or magnetic formats. Popular choices include Moment, PolarPro, and Sandmarc, which provide reliable optics and good coatings. Read reviews about fit and lens alignment with the iPhone 15 Pro, and choose a brand that offers clear guidance on mounting and care.