I have been checking out some images online with the ISO setting of the Powershot S410 and the Powershot S500, and it looks like the S500 has a lot of noise at the higher settings. Has anyone tried their S500 in dim room light with the ISO on 200 and 400? I'm thinking of rooms illuminated with only the light from a side window or something, shooting with existing light only. What are you finding? I would love to hear what either camera does with that sort of existing light situation since I like to shoot that way and don't like the look of flash. I'm thinking of handheld situations where the camera would open the shutter up all the way.