The ultra-wide-angle lens by Nippon Kogaku, the Nikkor-O 21mm f4, is designed for the Nikon S series. It was introduced in 1959 and has an optical construction of 8 elements in 4 groups. The serial number is 621xxx, with the first three digits being dummy numbers.
While the Nikkor 21mm lens for Nikon F is widely available, the one for the Nikon S series is extremely rare, with only about 298 units produced. The distance markings are in meters.
The dedicated viewfinder comes in its original box and has an optical construction of 5 elements in 5 groups. The serial number is 600xxx. It is made of lightweight plastic. Additionally, it includes a special deep rear cap with a mount for securing the viewfinder. This is a rare item.
There are no signs of mounting wear, and the exterior is very clean. It is as if you are looking at a brand-new item from that time. Fully overhauled in 2024. All parts operate very smoothly, providing a pleasant shooting experience, although it might be too pristine to use.
The lens has some slight coating wear on the inner elements and a few very shallow cleaning marks on the rear element, but these should not affect actual image quality.
The set includes the original box for the dedicated viewfinder (serial number 600xxx), a dedicated rear cap and leather case for the 21mm lens, a filter, and a front cap. This is a rare piece with an exceptional condition and rare accessories, making it a highly coveted item.
