Nikon Ai-S Zoom-Nikkor 25-50mm f/4 - Nikon F Mount

The Zoom-Nikkor 25-50mm f/4 Ai-S is a professional-grade wide-angle zoom lens for the Nikon F-mount. It maintains a constant f/4 maximum aperture throughout the focal range, providing consistent exposure settings. Renowned for its exceptional build quality and sharpness that rivals prime lenses of its era, it features a 72mm filter thread and a complex optical design of 11 elements in 10 groups. It is a substantial lens, favoured by landscape photographers for its rectilinear correction. When buying used, the zoom and focus rings should be checked for uniform resistance; these lenses are heavy and can develop 'zoom creep' if the internal helicoids are worn. We inspect for internal dust and ensure the constant aperture diaphragm responds quickly at all focal lengths. SDS verifies that the multi-coating is intact and free from cleaning marks, which can be common on these larger front elements.