For this lesson I took ISO of 100, 400, and 3200. Had to look in the manual in 20D settings to change them so the camera was capable of 3200 ISO. Then zoomed in on each shot in photoshop to see the difference in clarity of each shot. You can see the original shot on the left side of the gallery and zoomed in shot on the right. Look at the left one first then the right photo. You can really see the clarity difference! This wasn't my best photo while traveling in France for Columbus day weekend but the best photo to show this lesson. I also took a tower, dragon relief in a Louis the 14th period hotel in different ISO's and if I get time will upload them later.