Often after buying a good digital slr camera and point & shoot, we are fixated on auto mode for longer periods of time. Auto mode is the most easy and fast, but it does not give satisfaction creativity.For those who want to "pass and rising class" of the auto mode and want creative soul into the photographs produced, it helps us understand the concept of exposure. Renowned photographer, Bryan Peterson, has written a book called Understanding Exposure in which the concept of exposure are easily explained.
Peterson members illustration of three elements which must be known to understand the exposure, he was named the relationships between the three as a Triangle Photography. Each element in photography triangle is associated with light, how light enters and interacts with the camera.
These three elements are:
ISO - a measure of how sensitive the camera sensor to light
Aperture - how big open lens when the photo was taken
Shutter Speed - the span of a "window" in front of the camera sensor is open
The third element of interaction is called exposure. Change in one element will result in changes in other elements.
Parable Exposure Triangle
Perhaps the easiest way to understand the exposure is to provide a parable. In this case I like the parable of the exposure triangle as well as a water faucet.
Shutter speed for me is how long we open the tap.
Aperture is how wide we open the tap.
ISO is a strong impetus from the water taps.
While the water flowing through the faucet is received light camera sensor.
Certainly not a perfect metaphor, but at least we got the basic idea. as you can see, if the exposure is the amount of water coming out of the faucet, then we can change the exposure value by changing one or a combination of all three constituent elements. You change the shutter speed, mean change how long the water tap is open. Aperture change means changing how much water flow, while changing how strong encouragement from the water source.
Source : http://belfot.com/memahami-konsep-eskposur/
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