Introduction: This has been one of, if perhaps not the most difficult essay to write so far: it concerns a topic that’s fundamentally important for all serious photographers, yet is extremely difficult to define in a strict technical sense due to its very nature. It’s the only essay I’ve had to stop and start writing several times because I penned myself into a corner. What you read is the culmination of many sessions and days of work. I hope you find it useful.
Via Thomas Menk