Android app for neutral density filter calculation.
The play store version is uploaded at https://play.google.com/store/apps/details?id=org.kaziprst.android.ndfilter.
Please donate translations for the app so it works in your language - see res/values-sr/strings.xml for example.
To contribute title, short and long description create folder and files under locales/. See locales/sr-Cyrl-RS for example.