Nikon Nikkor-P Auto 105mm f/2.5 - Nikon F Mount

The Nikon Nikkor-P Auto 105mm f/2.5 is a legendary short-telephoto lens, often cited as one of the finest portrait lenses in the F-mount system. This 'Pre-AI' version features a Sonnar-derived optical formula, providing a signature look with sharp central resolution and smooth background fall-off. Its simple, durable mechanical design has made it a favourite for manual focus enthusiasts and film photographers. When assessing a used 105mm f/2.5, it is vital to confirm if it has been converted to AI (Aperture Indexing) to ensure compatibility with modern Nikon bodies. SDS checks for the presence of oil on the aperture blades, which can cause slow shutter response. The integrated lens hood, if present on later versions, should slide smoothly, and the glass is checked for fungal growth or separation common in older optics.