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Basics ofPhotography:

ISO,Aperture, and

Shutter Speed

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Basics of

Photography:Exposure Value

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the term exposure value refers to the relationship between:

aperture: the amount of light that the lens lets through tothe sensor

Exposure Value (EV)

shutter speed: the amount of time that the sensor is

exposed to the light

ISO: the sensitivity to light of the sensor

the term 0EV refers to a photograph that has a pleasingexposure:

a good balance between highlights and dark areas

nothing too dark, nothing too light: no image loss in either

direction

colour is strong throughout the gamut

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the term exposure value is a relative term

there are many combinations of aperture, shutter and ISOthat can achieve 0EV

Exposure Value (EV)

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1/800 @ f2.8 @ ISO 200

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1/400 @ f4.0 @ ISO 200

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1/200 @ f5.6 @ ISO 200

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1/125 @ f8.0 @ ISO 250

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1/125 @ f16 @ ISO 1000

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1/125 @ f22 @ ISO 2000

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the term 0EV can be confusing

photographers can use the term to refer to a perfect

exposure

Exposure Compensation (+/- EV)

Camera manufacturers use 0EV to refer to a picture that

has had no exposure compensation dialed in

many scenes that you will want to photograph will contain

portions that are brighter or darker than the rest of the scene

ie: that have different light values in the same scene

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Exposure Compensation (+/- EV)DSLRs contain light meters that examine every portion of thescene, and try to give you a 0EV photo based on what thecamera guesses is the most important part of the scene

ie: the camera tries to create an exposure that averages out

any drastic differences in light values

sometimes, however, the camera guesses incorrectly

this is why the camera has a built-in exposurecompensation that you can easily set

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Exposure Compensation (+/- EV)+EV means that you are overexposing your image

you are allowing more light to be exposed to the sensor,

either through a wider aperture or a slower shutter, or you

are making the sensor more sensitive (ISO )

-EV means that you are underexposing your image

you are allowing less light to be exposed to the sensor,

either through a narrower aperture or a faster shutter, or you

are making the sensor less sensitive (ISO )

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Exposure Compensation (+/- EV)when we decide to compensate the exposure we often wedont know what the perfect compensation will be

so we bracket our exposures

bracketing refers to the practice of taking the same picturewhile methodically moving through a series of EVcompensation values

typically we begin by underexposing and then workingupwards towards overexposing

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0 EV

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-3 EV

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-2 EV

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-1 EV

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0 EV

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+1 EV

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+3 EV

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0EV

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0.3 EV

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0.3 EV

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0.7 EV

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1 EV

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1/60 @ f13 @ ISO 200 @ -0.6

EV