I am trying to ascertain the importance of having lower ISO values available for digital SLRs.
With low noise levels even at higher ISOs, how much of a difference would be there be, between ISO 100 and ISO 200.
Assuming that one is shooting a landscape on a perfectly bright day, would a picture taken at ISO100 show a visible improvement over the one shot with ISO200 ? Would this difference be visible in A4 size prints?
For an amateur who is trying to get the best quality at a budget, this would be an important issue to understand. Where one spends a "lot" of money on lenses, seeking better quality, it might be good to understand the importance of the grain/pixel.