the iso if I remember right is the shutter operation speed the lower the number I think means the lower the milisecond count so the lower the number the faster the picture will be taken...

I found the best luck with shining a light right on what I wanted to picture and leave the camera on auto and it will choose a fast shudder speed cause it needs less time to absorb enough light to make the picture...the faster the pic is taken the easier it is to avoid blur unless you have a tripod or it's resting on something...

PS My camera that broke needed to be a few inches away before it would start to focus right but most cameras I know need closer to a ft