In the end Great Photography is the instant perception of seeing. It is not just recording a subject or taking a Snapshot. It is that moment ones’ accumulation of skill, knowledge and technique learned over time coincides with that instance of seeing. The shot comes into your awareness and one knows it is the moment.  Ansel Adams, one of the greatest photographers that ever lived, developed “Pre-visualization”, the technique of his “Zone System” in attempting to preempt the outcome of a photograph.  Then, would spend sometimes days manipulating it in the Darkroom . In many cases, one does not have time to carefully prepare, set up and plan a photograph because light, shadow, and subsequent tonality are constantly changing.