Calculate perfect exposure times with neutral density filters. Enter your base shutter speed and ND strength for both exact and rounded results.
Exposure time doubles for each stop. Rounding uses the nearest common shutter speed value. Long exposures display in seconds or minutes.
Scenario: Shooting a waterfall with a 6-stop ND filter
Base exposure: 1/60s at f/8, ISO 100
With 6-stop ND: 1/60 × 64 = 1.067s ≈ 1s
Result: Smooth, silky water motion instead of frozen droplets
One stop equals a doubling (or halving) of exposure time. A 3-stop ND filter reduces light by 8× (2³).
Yes! Add the stops together. A 3-stop + 6-stop = 9-stop total reduction.
Real cameras use discrete shutter speeds. We choose the closest standard value for practical use.
Most variable NDs range from 2-8 stops. Check your filter's markings or test with a light meter.
No, ND filters only affect shutter speed. Keep your aperture and ISO the same for equivalent exposure.
Equivalent Exposure Calculator · Astro Shutter Limit · Sunny 16 Rule