Cause someone showed me how to change it at a Christmas Eve party I was at- I was taking pictures of my kids and adjusting the ISO based on how the picture looked on the LCD screen (is that what it's called?), anyways, My questions is.. Should it look the same on that tiny screen as on my computer? Or do I just adjust knowing that when I thought it was too dark it really looked fine on the computer?? or, am I supposed to know what ISO I wanted???