The best lenses will have to be equipped with even faster apertures such as f/1.8, f/1.4, or even f/1.2. These lenses are often known as prime lenses and normally do not have zoom capabilities but instead have a fixed focal length. Prime lenses are more expensive because of their fast and constant aperture capabilities they are often lighter and great for traveling with while you chase the night sky, milky way, or other low light situations.