# Ev100

> A value that represents a combination of a camera's shutter speed and f-number.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.Rendering](/engine/6000.6/script-reference/unityengine/rendering.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
Ev100 = 4
```

### Remarks

It is essentially a measurement of exposure such that all combinations of shutter speed and f-number that yield the same level of exposure have the same EV. Lights can use EV100, which is EV with a 100 International Standards Organisation (ISO) film.

Compatible light types: [LightType.Point](/engine/6000.6/script-reference/unityengine/lighttype/point.md), [LightType.Spot](/engine/6000.6/script-reference/unityengine/lighttype/spot.md), [LightType.Pyramid](/engine/6000.6/script-reference/unityengine/lighttype/pyramid.md), [LightType.Rectangle](/engine/6000.6/script-reference/unityengine/lighttype/rectangle.md), [LightType.Disc](/engine/6000.6/script-reference/unityengine/lighttype/disc.md), [LightType.Tube](/engine/6000.6/script-reference/unityengine/lighttype/tube.md).

Additional Resources: [Light.lightUnit](/engine/6000.6/script-reference/unityengine/light/lightunit.md), [light component](/engine/6000.6/manual/lighting-overview/lighting-birp/class-light.md).