ISO to stops from ISO 100
Type a value in ISO to get it in stops instantly.
2stops
That's about the same as general-purpose film. That is 2 stops from ISO 100.
Convert the other way: stops to ISO
What it means
How sensitive is that?
Digital cameras quote an ISO-equivalent sensitivity. Above the base ISO the sensor is not more sensitive, only amplified — which is where the noise comes from.
The math
How to convert ISO to stops
DIN is logarithmic and ISO is not: DIN = 10 × log₁₀(ISO) + 1, so every doubling of ISO adds three DIN degrees.
Example: 400 ISO = 2 stops.
Every unit
Your speed in every unit
Tables
ISO to stops conversion table
| ISO | stops |
|---|---|
| 25 ISO | -2 stops |
| 50 ISO | -1 stops |
| 100 ISO | 0 stops |
| 200 ISO | 1 stops |
| 400 ISO | 2 stops |
| 800 ISO | 3 stops |
| 1,600 ISO | 4 stops |
| 3,200 ISO | 5 stops |
| 6,400 ISO | 6 stops |
| 12,800 ISO | 7 stops |
stops to ISO conversion table
| stops | ISO |
|---|---|
| -2 stops | 25 ISO |
| -1 stops | 50 ISO |
| 0 stops | 100 ISO |
| 1 stops | 200 ISO |
| 2 stops | 400 ISO |
| 3 stops | 800 ISO |
| 4 stops | 1,600 ISO |
| 5 stops | 3,200 ISO |
| 6 stops | 6,400 ISO |
| 7 stops | 12,800 ISO |
Quick answers
Quick answers
- How many stops is 1 ISO?
- 1 ISO is -6.64386 stops.
- How many stops is 10 ISO?
- 10 ISO is -3.32193 stops.
- How many stops is 400 ISO?
- 400 ISO is 2 stops.
The units
About these units
ISO (ISO)
The modern arithmetic speed, the number on the box.
Stops from ISO 100 (stops)
How many doublings away from ISO 100 the speed is.
Keep going