Originally Posted by
Manfred M
.....All sensors have a fixed "ISO" and any setting above that results from amplifying the signal. The moment gain is added, the dynamic range starts dropping, the amount of digital noise in your image goes up and the colour bit depth drops. In other words, the image quality will start to deteriorate.
That being said, one should shoot at an appropriate ISO setting to get the image. Sticking with the lowest ISO and introducing motion blur from camera shake or shooting a scene with too wide an aperture to get the critical parts of the image in focus don't make a lot of sense either.....