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11. How does Sensitivity affect the light in my picture? As discussed above, the higher the film or sensor’s sensitivity to light, the less light is required to properly expose your scene. Being able to adjust this setting has obvious advantages. For instance, sometimes, when nature is not cooperating, the available light is too low for your camera equipment to capture the scene in the fashion you see fit. By increasing the sensitivity of your photo-sensitive medium, the effect of that light is greatly increased allowing the photographer to move the scene back toward mid-tone and back onto the acceptable tolerance of the medium. For example, the picture below was taken well after sunset. Yet increasing the ISO-relative sensitivity of my digital sensor I was able to collect much more light than you may expect, or be able to detect with your naked eye.
ISO 1600, 88mm, F/5.6, 1/3 sec
However, as all camera settings
are, sensitivity setting constitute a balancing act as well. The more
sensitive the photo-sensitive medium becomes, the more apt it is to record
noise. This often results is graininess for film users, and digital
noisiness on digital sensors. To demonstrate, look below at the enlarged
portion of the above picture. At a small scale the picture seems sharp
enough, but in the enlargement you can see noise resulting from the
high sensitivity. The lines of the scene are not clearly defined. So keep
that in mind when using high level of sensitivity.
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