Axis

Photography

exposure valueEV

Exposure value: EV = log₂(N²/t) for aperture N and shutter t.

Dimension
1
Canonical signature
1
System
common
Exactness
Context dependent

Definition record

How this unit is defined

Canonical base
This unit defines its own base.
Conversion type
context
Historical notes
Illuminance from EV uses the standard ISO-100 constant 2.5 lux per EV.
Aliases
EV, exposure value photography

Same dimension

Related units

percentcommon%decibelsi accepteddBparts per millioncommonppmMach numbercommonMaparts per billioncommonppbspecific gravitycommonSGparts per trillioncommonpptper millecommon‰

Common conversions

Every conversion routes through the canonical base of the dimension.

This unit defines its own dimension.