It's not a triangle: it's the exposure quadrangle - DIY Photography
GitHub - awoisoak/Camera-Exposure-Calculator: Android app that helps you to calculate the desired exposure parameters from a based exposure (ND filter supported)
Review of "Exposure Calculator" App for Android by Quicosoft (Video) - Craig Rogers
GitHub - awoisoak/Camera-Exposure-Calculator: Android app that helps you to calculate the desired exposure parameters from a based exposure (ND filter supported)