ND1000000 exposure conversion#
Meter without the filter, then multiply the shutter time by 1,048,576.
| Without filter | With ND1000000 |
|---|---|
| 1/4000 s | 262.1 s |
| 1/2000 s | 524.3 s |
| 1/1000 s | 1048.6 s |
| 1/500 s | 2097.2 s |
| 1/250 s | 1.2 h |
| 1/125 s | 2.3 h |
| 1/60 s | 4.9 h |
| 1/30 s | 9.7 h |
| 1/15 s | 19.4 h |
| 1/8 s | 36.4 h |
| 1/4 s | 72.8 h |
| 0.5 s | 145.6 h |
| 1 s | 291.3 h |
| 2 s | 582.5 h |
ND calculator & countdown timer#
What a ND1000000 filter is for#
ND1000000 (also sold as ND 6.0 or “20-stop”) is typically used for: Solar photography (only with certified solar filters!) and extreme long exposures.
For video: in bright sun at f/2.8 and ISO 100 you need about 6.4 stops of ND to shoot at 1/50 s (the 180° shutter rule at 25 fps). This filter alone is enough.
Tips: compose and focus before attaching dark filters, cover the viewfinder eyepiece on DSLRs to stop light leaks, and expect a colour cast with strong NDs — shoot RAW and set white balance afterwards.
Other ND strengths#
Frequently asked questions#
How many stops is a ND1000000?
20 stops — it passes 1/1,048,576 of the light (density 6.0).
What shutter speed with a ND1000000 filter?
Multiply your unfiltered shutter speed by 1,048,576. For example 1/125 s becomes 8388.6 s.
Last updated October 03, 2026 · How we calculate · Sources