ISO measures the sensitivity of the image sensor. The same principles apply as in film photography – the lower the number the less sensitive your camera is to light and the finer the grain. In film photography it was the length of time that the film was exposed to the scene you’re photographing and similarly in digital photography shutter speed is the length of time that your image sensor ‘sees’ the scene you’re attempting to capture.
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The exposure triangleThese are the main components to a good exposure:
Aperture is when you hit the shutter release button of your camera a hole opens up that allows your cameras image sensor to catch a glimpse of the scene you’re wanting to capture. The aperture that you set impacts the size of that hole-the larger the hole the more light that gets in – the smaller the hole the less light. |
experimenting with exposures
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Certain pictures, even though they may appear blurry, hazy or defined as a 'bad' picture, are good to keep as a reference as they show that you have experimented with the components among the exposure triangle.
Furthermore, these accidental images may come in handy at unexpected times especially those that aren't so easy to recognize could be made out to be numerous subjects as well as appear to deliver a unique optical illusion. |