Nikkor-N 25mm 1:3.5 Auto

In August 2018 a number of prototype Nkkors were listed on Yahoo Auction Japan. The seller cancelled before the listing completed, but a number of images were saved.

The lens shown here is a prototype Nikkor-N 25mm 1:3.5 lens. During the early 1960s Nikon was actively looking for ways to design a practical lens wider than 28mm which did not require mirror lock-up as with the Nikkor-O 2.1cm lens