Schertz - 67mm Variable ND2-400 (1–9 Stops) Filter – Adjustable Neutral Density, Multicoated Glass with Cap & Cleaning Cloth

1. Variable ND filters work on polarization principles. At maximum aperture, an X pattern may occur with certain lenses and focal lengths; if this happens, reduce the ND level. 2. For long exposure photography requiring substantial light reduction, consider fixed ND