I love to photograph aircraft with my point and shoot camera. Half the time, the camera is unable to properly focus, as the plane is far away and the autofocus cannot handle this. It can't focus on a clear blue sky. Are there any point and shoot cameras out there with a manual setting for Infinity? It would also have to have at least an 18X zoom as well. I know I really need an expensive SLR which has an Infinity/Manual setting but since I bring my camera to places like the beach, I know that water and sand will enter the mechanism. In the past, I have ruined many cameras after getting water droplets and/or sand inside. Any suggestions about my focusing problem other than an SLR? Thanks.