13
Stops of light reduction
3.9
Optical density (ND x.x)
0.01221%
Light transmitted
×8,192
Exposure time multiplier
ND8000 exposure conversion#
Meter without the filter, then multiply the shutter time by 8,192.
| Without filter | With ND8000 |
|---|---|
| 1/4000 s | 2 s |
| 1/2000 s | 4.1 s |
| 1/1000 s | 8.2 s |
| 1/500 s | 16.4 s |
| 1/250 s | 32.8 s |
| 1/125 s | 65.5 s |
| 1/60 s | 136.5 s |
| 1/30 s | 273.1 s |
| 1/15 s | 546.1 s |
| 1/8 s | 1024 s |
| 1/4 s | 2048 s |
| 0.5 s | 1.1 h |
| 1 s | 2.3 h |
| 2 s | 4.6 h |
ND calculator & countdown timer#
Shutter speed with filter—
Light reduction—
0:00
What a ND8000 filter is for#
ND8000 (also sold as ND 3.9 or “13-stop”) is typically used for: Multi-minute daylight exposures that make crowds disappear.
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 ND8000?
13 stops — it passes 1/8,192 of the light (density 3.9).
What shutter speed with a ND8000 filter?
Multiply your unfiltered shutter speed by 8,192. For example 1/125 s becomes 65.5 s.
Last updated October 03, 2026 · How we calculate · Sources