"A lens with a lower f-number (larger aperture) allows more light to reach the image sensor, which is beneficial for low-light performance. For example, an aperture of f/2.0 lets in significantly more light than f/3.6, f/5.6, or f/8.0."

— Axis Communications Academy, Network Video Fundamentals, 2022

"The amount of light entering the camera is inversely related to the f-number. The lower the f-number, the wider the aperture, and thus, more light is gathered by the image sensor."

— Axis Communications, Lens Guide