Colin Prior is one of the world's most acclaimed landscape photographers, someone who made his name with a set of panoramic images that defined wild Scotland for a generation. But, using the latest digital technology, he is attempting to capture a definitive record of three iconic mountains in the northwest Highlands. These include what many regard as our finest summit, An Teallach. We've been following his progress, between the winter and spring equinoxes, and discover that the result of six months of work is just a handful of images.