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AF-S NIKKOR 58mm f/1.4G

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.

Trial and error for extreme accuracy

What were the most difficult factors in the development of the AF-S NIKKOR 58mm f/1.4G?

In the optical design, when measuring aberrations, sagittal and meridional planes divide light rays horizontally and vertically. And aberrations are calculated in both directions at different points from the center of the lens toward the edges. To develop a lens that achieves faithful reproduction of point light sources even at the peripheries, at the maximum aperture, an extremely large amount of work was required to suppress aberrations to the limit across the entire frame.
During this procedure, it happened that a point light source was not reproduced as a point image when examining aberrations although the point indicated high MTF performance. It is comparatively easy to enhance MTF only at the spatial frequency of 30 lines/mm, but this fact clearly proves that the actual image cannot be evaluated with resolving power only at a specific spatial frequency. Actually, subjects contain both low- and high-frequency portions in a more complex way. We repeated trial and error to investigate the effects of aberrations according to the frequencies of subjects. It is not possible to eliminate lens aberrations completely. So we designed the lens to ensure comfortable image creation utilizing residual aberration while trying to reduce them to the limit.

New suggestion for further refinement of a NIKKOR lens depiction

Do you have a message for your customers?

We developed the AF-S NIKKOR 58mm f/1.4G inheriting the basic design concept of the Noct Nikkor, but our aim was not to produce a "modern version of Noct Nikkor". This lens is the fruit of our strong desire in the development of various lenses over a long time to realize a lens that enables most comfortable image creation. NIKKOR celebrates its 80th anniversary this year. The intensity of thoughts from our predecessors and tradition of long history are concentrated into NIKKOR. I am confident that this lens can be a very individual addition to the lineup of NIKKOR, albeit not the most powerful. I hope our customers regard the AF-S NIKKOR 58mm f/1.4G as a "plus-factor lens" or "must-have lens".