The purpose of this exercise is to demonstrate the trade off between high and low ISO settings. With high settings it is possible to capture just about anything hand-held, including moving objects in low light. The price to pay is in grainy or "noisy" images.
Here I have taken two scenes at several ISO settings in AP mode, all hand-held. No post-processing has been applied, except to add shooting data to the images. The first set was shot indoor under low light.
As is evident in this series, bumping up the ISO increases the possibility of freezing movement. At 100 there is quite a lot of blur, which is steadily reduced at 400 and then 800, but not eliminated until 1600. In return, however, the images have become grainier, shown here in this close-up of the foreground display.
A second set of images was taken outdoors at twilight along the banks of Dubai Creek.
At lower ISO settings the camera produced smoother images, most clearly evident in the colored reflections. As ISO increases, individual ripples in the water begin to emerge and the reflections take on a sparkling quality. On the other hand, higher ISO produces more noise, as seen in these sections at 100 and 4000.
The lesson? Higher ISOs can help in capturing images in low-light or objects moving at high speed, but in return one can expect less than clear images.
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