ISO: the pixie dust of photography
Wednesday, September 16, 2009 at 5:03PM ISO (the sensor's light sensitivity) is sorta the 'pixie dust' of photography. It is not a mechanical process (such as shutter speed and aperture) and no longer a chemical process as when shooting with film. Now it is something as intangible as a pixel (whatever that really is) that catches a certain amount of light depending on the set ISO value.



