I have the kit lense that came with the Canon XS....its the 18-55 3.5/5.6 IS lense. I was wondering, when I put it to manual mode, why can I only get it to aperature 4? Why can't I bring it lower than that? I was assuming that since the lense is rated at 3.5, that I could get it to 3.5. On another note, I notice its rated to 5.6 on the other end, but I can adjust to 20+. I'm new at this, so any tips/advice/answers are greatly appreciated! Thanks again guys.