How many trade secrets do you keep? Most of us, if not all of us, are happy to share our knowledge with newcomers to the craft. However, I think most of us have one thing that we keep to ourselves. In my case, it's a manual focus lens that I use adapted to a mirrorless camera. It's a very minor thing, but I find it fun, knowing that I'm keeping it to myself. Needless to say, it cannot be revealed via metadata. What about you?