ND Filter Long-Exposure Calculator
Find the right ND filter and exposure time for any daylight long exposure.
Final exposure
8 min 32 s
Effective stops
10
Base exposure
1/2 s
Targets the r/Photography and r/LandscapePhotography recurring 'how long to expose at f/11 with ND1000' question. Math: longer exposure = base × 2^stops.
About this tool
Enter your base shutter speed, the ND filter strength (ND2 → ND100000), and (optionally) reciprocity failure. Get the corrected exposure time in seconds / minutes, plus a daylight / dusk / night preset list. A clean answer to the r/Photography 'what ND do I need to blur waterfalls at noon' question.
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