Looking for some info. I am going on vacation next and taking a friends 28-300 canon lens. I know that the IS will give you a couple of stops down. This enables you to shoot at a shutter speed or ISO less than you otherwise would in order and still avoid shake. My question is whether this is something that only applies to manual controls. On full auto or other programs where ISO or shutter speed is set by the camera will it recognize the lens and automaticlly set a slower shutter, lower ISO to take a better picture? Any answers or advice on how to best utilize this would be appreciated. Thanks in advance.