[FONT=Arial, Helvetica, sans-serif]This is one of the strongest reasons I prefer my Nikons to my Canons, which lack this critical feature.[/FONT]
[FONT=Arial, Helvetica, sans-serif]ISO Auto Increases sensitivity (ISO) in dim light automatically to prevent blur from slow shutter speeds.[/FONT]
[FONT=Arial, Helvetica, sans-serif]I use this all of the time, unless I'm using manual exposure mode. Auto ISO is a crucial component of
Modern Exposure Technique.[/FONT]
[FONT=Arial, Helvetica, sans-serif]Today I adjust the Auto ISO's minimum shutter speed as I change lenses and conditions. I no longer adjust ISO directly, as we did in the old days before 2004. This is a time-saving step towards the future, just as program exposure was a step ahead of aperture priority in the 1970s.[/FONT]
[FONT=Arial, Helvetica, sans-serif]You can choose the highest ISO to which the Auto ISO will go (Max sensitivity). I let my D80 go all the way to to ISO 1,600, since it looks fine at ISO 1,600 and any small amount of grain is better than a blurry photo. If you prefer blur to grain, feel free to limit the D80 to ISO 800 or 400. Try ISO 1,600: the D80 is better at high ISOs than film ever was, and far better than any compact digital camera at these speeds.[/FONT]
[FONT=Arial, Helvetica, sans-serif]You also may set the minimum shutter speed (Min Shutter Speed) below which the D80 starts raising the ISO. Select the slowest shutter speed at which you'll get sharp images under your present shooting conditions.[/FONT]
[FONT=Arial, Helvetica, sans-serif]I wish this function was smart enough to recognize which lens I'm using and adjust accordingly, but it's not.[/FONT]