Exposure Triangle and Stop in Photography
In Photography , we often read and hear about word “Stop”.
No, isn't stop like what you think, it’s not stop that mean stop to move. Word “stop" in this
case meanings the term in photography. For example using of word “stop” : “ because the photo looks too
over, just lower one stop” , just like that.
If until this moment, the word "stop" in photography still
make you confuse, let see this short explanation bellow.
Definition of Stop
More or less Stop in photography meanings the changes of the number of lights that received by censor/ film, so it will influence photo
exposure. Increase one stop meanings more bright multiple by 2 , increase 2 stops meanings more bright 4 times from basic exposure. Drecreasing one
stop meanings darken multiple by an half (1/2). One stop is the changes of number
of lights multiple by 2.
Such as you know commonl exposure is the number of lights that
received by censor . And Increase one stop meanings increase exposure in multiple by 2. How to increase and decrease exposureproperly? We
can change just one or combination of three element that arrange the exposure triangle, they are: Shutter speed, Aperture, and ISO.
Still confused? Allright, for example inside room there
are 4 lamps each 100 watt and they are turning on. Because Stop is the change of dark
and bright, then lower one stop ,it means that you must turn off two lamps , therefore only
two lamps are turning on. Meanwhile, to increase one stop meaning you must
take 4 lamps more with the number of same watt and turn on that all lamps. In this case, the room is
censor in digital camera ,meanwhile the light of lamp is the exposure.
Stop
and Shutter Speed
Shutter speed measures how long censor receiving the
lights. More long shutter speed, it means that more lights that censor received
( increasing exposure). In shutter speed, full one stop is easy to remember
because its result of division from numeral 2 ( with integration) : 1, ½, ¼,
1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000, & etc. Move one stop meanings jump once, for example from 1/30 to 1/125. Move 2 stops meaning jump twice.
Stop
and ISO
Easy things in ISO, multiple by 2 meanings increase
one stop. ISO 100 to ISO 200 meanings one stop, 200 to 400, and etc. If someone
ask you how many stop from 1100 to 1600, so How many stops ? yes there are 4
stops.
Stop
and Aperture
It more difficult in aperture because the numer jumping randomly: f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16 and etc.
What the relation of them ( Sperture,
Shutter Speed, and ISO)
For example if you using formely setting of camera
like this : 1/125, f/8 and ISO 100. Because the photo result is under exposure
(dark), if you wanna increase one stop it can be means 3 things :
1/60, f/8, and ISO
100 ( only shutter that changes), or
1/125, f/5.6,and ISO 100 (only aperture that changes),
or
1/125, f/8, and ISO 200 ( just ISO that changes)
All changes meaning one stop.
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