A 3-stop neutral density filter (ND8) cuts light by a factor of 8. It's typically used for smoothing waterfalls in shade and softening ripples.
Find your exposure in the chart, or use the calculator with your metered shutter speed.
3-stop ND exposure chart
| Without filter | With 3-stop ND (ND8) |
|---|---|
| 1/8000 s | 1/1000 s |
| 1/4000 s | 1/500 s |
| 1/2000 s | 1/250 s |
| 1/1000 s | 1/125 s |
| 1/500 s | 1/62 s |
| 1/250 s | 1/31 s |
| 1/125 s | 1/16 s |
| 1/60 s | 1/8 s |
| 1/30 s | 1/4 s |
| 1/15 s | 1/2 s |
| 1/8 s | 1.0 s |
| 1/4 s | 2.0 s |
| 1/2 s | 4.0 s |
| 1 s | 8.0 s |
| 2 s | 16 s |
| 4 s | 32 s |
Filter factor 8×, optical density 0.9.
Other strengths
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