Peripheral light falloff is well controlled to retain brightness even at infinity, at the maximum aperture
Why was the maximum aperture of f/1.4 selected?
The main reason is to retain brightness with minimized peripheral light falloff. While featuring a 58 mm focal length as a homage to the Noct Nikkor 58mm f/1.2 lens, we selected the f/1.4 maximum aperture for this reason.
Generally, large-aperture lenses are likely to suffer from peripheral light falloff. However, the AF-S NIKKOR 58mm f/1.4G retains brightness with minimized light falloff even with the focus distance set to infinity at the maximum aperture. Less peripheral light decreases the advantage of faithful reproduction capability of point light sources across the entire frame at the maximum aperture. Considering this point, we determined the f/1.4 maximum aperture to be optimum. I think capturing unique photographs utilizing sustained peripheral light and point-light-source reproduction capability will be highly enjoyable.