When photographers talk about the “look” of a lens, they’re often referring to the way it renders out-of-focus areas, or bokeh. Bokeh is the quality of the blur in the background of a photograph, and it can vary significantly from lens to lens. One of the factors that affects bokeh is the shape of the lens’s diaphragm blades. Diaphragm blades are thin, metal leaves that form the opening of the lens. When you adjust the […]