The term "120mm" often refers to a measurement used in photography, specifically for lenses. A 120mm lens is considered a medium telephoto lens, which allows photographers to capture subjects from a distance while still maintaining good detail. This type of lens is popular for portrait photography, as it provides a flattering perspective and a nice background blur, known as bokeh. In addition to photography, "120mm" can also refer to the size of film used in certain cameras, particularly medium format cameras. Medium format film is larger than standard 35mm film, allowing for higher resolution images and greater detail. This makes 120mm film a favorite among professional photographers who seek exceptional image quality.