Hey everyone, There are a lot of talented photographers who post on this forum and I'm honored to be able to ask questions to you guys. Here's one that's been bugging me for a long time... what ISO values should be used in the real world? I have had a Rebel XT (my first DSLR) for the past three months and have kept the ISO down to 100 to reduce noise. I have been relatively happy with the results, but I'm just a newbie, and for all I know I could have ruined some perfectly doable shots by sticking to such a low sensitivity. What do you guys use and in what situations? What do you notice as far as image quality reduction and noise? Anyone have particular experience with the XT? Also, is there anyone out there who also keeps their ISO down to 100 all the time? I may just continue doing that if it's what you guys do. Thanks so much, any help at all would be greatly appreciated.