The following exercise shows how increasing the camera’s sensitivity can aid shooting in low light conditions. The following images show the same photograph taken at ISO 100 (left) and ISO 800 (right). The initial difference I noticed was that as a result of the higher sensitivity, I was able to decrease the shutter speed creating a much less blurred shot. All comparable shots below were taken using the same aperture so that changing the ISO affected shutter speed only:
It is clear from
these images that the images taken at ISO 800 are much less blurred, showing
the benefits of using a higher sensitivity. One drawback however is that as the
ISO is increased, a speckled texture known as grain appears in the image. The
image shows a close up of a section of the red rose at both sensitivities; it
is clear that more grain is shown at ISO 800, especially in the darker areas.
My last two images show an increase in sensitivity from ISO
100 to ISO 400; even at this setting, grain is increased in the image.
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