Sigma's diagonal fisheye for full-frame — same as ID 1215, possible duplicate listing.
The Sigma 15mm f/2.8 EX DG Diagonal Fisheye is a full-frame diagonal fisheye providing 180 degrees of corner-to-corner coverage with f/2.8 aperture and autofocus — available for multiple DSLR mount systems from Canon EF to Nikon F.
Optically good for a fisheye — sharp in the centre with the intentional extreme barrel distortion characteristic of fisheye optics. The f/2.8 aperture is fast for a fisheye lens — useful for astrophotography all-sky captures and creative low-light work.
Available for Canon EF, Nikon F, and Sony A mounts. Bulbous front element without standard filter thread — rear gel filter holder provided. Approximately 370g making it compact for the specification. EX build quality with full-frame coverage.
Available used at budget to mid-range prices. The 180° diagonal fills the entire full-frame sensor — more practical than circular fisheyes for most creative applications. Also sold for astrophotography all-sky imaging. Check front element for scratches.