UNDERSTANDING EXPOSURE

Extreme Exposure

Often, after buying a good Digital SLR Cameras and point & shoot, we are fixated on auto mode for longer periods of time. Auto mode is most easily and quickly, but do not give creative satisfaction.

For those who want to "pass and the next grade" from the auto mode and want to channel the creative spirit into the resulting photographs, it helps us understand the concept of exposure. Renowned photographer, Bryan Peterson, has written a book called Understanding Exposure, you can read that book to increase you Photograph knowledge.

Peterson gave the illustration of the three elements that must be known to understand the exposure, he named the three as a Triangle Relationship Photography. Each element in the photographic triangle is associated with light, how light enters and interacts with the camera.
These three elements are:

• ISO : the measure of how sensitive the camera sensor to light
• Aperture : how big the lens is open when the photo was taken
• Shutter Speed ​​: time range "window" in front of the camera sensor is open

The third element of interaction is called exposure. Changes in one element will lead to changes in other elements.

Parable Exposure Triangle
Perhaps the easiest way to understand the exposure is by giving a counterpoint. In this case I like the parable of the exposure triangle like a water faucet.

• Shutter speed for me is how long we open the tap.
• Aperture is how wide we open the tap.
• ISO is the strong encouragement of water from the water company.
• The water that flows through the taps are received light sensor camera.

Certainly not a perfect metaphor, but at least we got the basic idea. as you see, if 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, it means changing how long a open faucet. Aperture change means changing how much water flow, while changing how strong encouragement from the water source.