Full-frame fisheye prime lens for Nikon F-mount cameras.
The Sigma 15mm f/2.8 EX DG Diagonal Fisheye is a full-frame diagonal fisheye lens for Nikon F mount, providing a 180-degree diagonal field of view that fills the full 35mm frame corner-to-corner. The D designation indicates D-type CPU distance information transmission to compatible Nikon bodies.
15mm focal length, f/2.8 maximum aperture, diagonal fisheye (180-degree corner to corner on full-frame), full-frame coverage, D-type CPU, Nikon F mount.
A diagonal fisheye at 15mm fills the full 35mm frame with a 180-degree field of view and characteristic fisheye barrel distortion. Used for creative photography, immersive VR pre-production, and scientific imaging where extreme wide-angle coverage is required. Full-frame coverage distinguishes it from APS-C circular fisheye designs.
Confirm this is the diagonal (frame-filling) fisheye rather than a circular fisheye. Test the 180-degree coverage on a full-frame Nikon body. Inspect the large protruding front element for scratches. Test aperture blades. Confirm Nikon F mount engagement.