You do a very good job of illustrating my point about matching technology to your needs. I'm not a photographer, and we don't have canyons to explore in the Ohio River valley. Clearly, your needs are far more complex than mine, and I fully agree that, for you, the iPhone is a remarkably effective way to meet those needs. I remember my photography friends carrying 5 or 6 pounds of camera gear in the old days; somehow, they were never smiling as they walked along the trail.