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Stefan Ahlblad
sahlblad@gmail.com
(C) Stefan Ahlblad 2015 All rights reserved 
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As can be observed from these images the grain is becomming appearant already at ISO 400. Still a reasonable grain control is maintained up to ISO 1600. Beginning at ISO 3200 the grain is clearly visible. However, in situation where grain is not an issue or the image is not intended to be enlarged beyond letter size even ISO 25600 can be an useful option.
These sample images were produced with a  Sony 16MP APS-C camera. The ISO performance varies among cameras, but the basic trend is similar for most cameras with similar size image processor.
 The ISO-level's impact on image quality 
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art.jpg photos1001001.jpg lenstest.jpg page%201.jpg photoalbum.jpg abc.jpg videos.jpg