I’ve built a free ND Filter Calculator you can install on your phone and use in the field — even without signal.

OPEN AND DOWNLOAD ND FILTER CALCULATOR

Install on your phone

📲 Android

  • Tap ⋮ (top right)

  • Tap Install app

  • Tap Install

📲 iPhone

  • Tap Share (↑)

  • Tap Add to Home Screen

  • Tap Add

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