ND32000 exposure conversion#
Meter without the filter, then multiply the shutter time by 32,768.
| Without filter | With ND32000 |
|---|---|
| 1/4000 s | 8.2 s |
| 1/2000 s | 16.4 s |
| 1/1000 s | 32.8 s |
| 1/500 s | 65.5 s |
| 1/250 s | 131.1 s |
| 1/125 s | 262.1 s |
| 1/60 s | 546.1 s |
| 1/30 s | 1092.3 s |
| 1/15 s | 2184.5 s |
| 1/8 s | 1.1 h |
| 1/4 s | 2.3 h |
| 0.5 s | 4.6 h |
| 1 s | 9.1 h |
| 2 s | 18.2 h |
ND calculator & countdown timer#
What a ND32000 filter is for#
ND32000 (also sold as ND 4.5 or “15-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 ND32000?
15 stops — it passes 1/32,768 of the light (density 4.5).
What shutter speed with a ND32000 filter?
Multiply your unfiltered shutter speed by 32,768. For example 1/125 s becomes 262.1 s.
Last updated October 03, 2026 · How we calculate · Sources