ND Filter Calculator

Exact long-exposure shutter times for any neutral density filter.

Base shutter speed (seconds)

e.g. 0.5 = 1/2 s · 0.008 = 1/125 s · 4 = 4 s

ND filter

Exposure compensation (stops, optional)

e.g. +0.33 for the half-stop between 10 and 13 stops.

Shutter time with filter

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Calculated with ShutterMath’s ND filter calculator