What is the best focal length? 28mm-35mm-50mm-wider or longer? A leading question for some is undoubtedly meant to be the title of this article, but what is the correct answer? That answer is simple, yet complicated by the effort required to achieve simplicity. The (simple)correct answer is the one you have with you. You have mastered it or are on the way to mastering it. This focal length matches the vision in the heart.