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Exposure Value

Exposure value is a number that represents a combination of a camera's shutter speed and f-number, such that all combinations that yield the same exposure have the same exposure value (for any fixed scene luminance).

Exposure value is proportional to the logarithm of the f-number squared divided by the shutter speed/exposure time.

Formula

QuantityVariable["EV", "Unitless"] == Log[(Quantity[1, "Seconds"]*QuantityVariable["N", "Unitless"]^2)/QuantityVariable["t", "Time"]]/Log[2]

symbol description physical quantity
EV exposure value "Unitless"
N f­number "Unitless"
t shutter speed (exposure time) "Time"

Forms

Examples

Get the resource:

In[1]:=
ResourceObject["Exposure Value"]
Out[1]=

Get the formula:

In[2]:=
FormulaData[ResourceObject["Exposure Value"]]
Out[2]=

Use some values:

In[3]:=
FormulaData[ ResourceObject[ "Exposure Value"], {QuantityVariable["N","Unitless"] -> 1.`, QuantityVariable["EV","Unitless"] -> 0.`}]
Out[3]=

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