A 15-stop neutral density filter (ND32768) cuts light by a factor of 32768. It's typically used for very long daylight exposures and removing people from busy scenes.
Find your exposure in the chart, or use the calculator with your metered shutter speed.
15-stop ND exposure chart
| Without filter | With 15-stop ND (ND32768) |
|---|---|
| 1/8000 s | 4.1 s |
| 1/4000 s | 8.2 s |
| 1/2000 s | 16 s |
| 1/1000 s | 33 s |
| 1/500 s | 1 min 6 s |
| 1/250 s | 2 min 11 s |
| 1/125 s | 4 min 22 s |
| 1/60 s | 9 min 6 s |
| 1/30 s | 18 min 12 s |
| 1/15 s | 36 min 25 s |
| 1/8 s | 1.1 h |
| 1/4 s | 2.3 h |
| 1/2 s | 4.6 h |
| 1 s | 9.1 h |
| 2 s | 18.2 h |
| 4 s | 36.4 h |
Filter factor 32768×, optical density 4.5.
Other strengths
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