The Nikon Nikkor 28 mm f/ 2.8 Ai is a fast wide-angle prime lens for 35 mm Nikon F SLR cameras
Extract from the book "Non-autofocus Nikkor Lenses", 2004, B. Bakst, I. Bazhan
"The lens took an intermediate position between the expensive and fast 28 mm f/2 and the budget 28mm f/3.5 lenses. This successful intermediate variant attracted well-deserved attention. As opposed to the AIs modification, the system of CRC is not used in the optical scheme of this lens."
Compatibility with converters: