I am going hill climbing this weekend and I want to take a photo of myself at the top with the views of surrounding hills and valleys behind me. My question is how do I get the camera to focus on where I intend to stand when I will have to be at the camera to press the shutter release button to start the self timer. There is a cairn on the hill top which the camera will sit so no problems with stability but I just can't see how the camera will know where to focus. Can anyone suggest a solution to my query. My camera is a Sony A200 and I have three lenses to choose from 18-70 mm, 50 mm and 70-300 mm . Any help gratefully received. Thanks