Canon's FD ultra-wide — 20mm f/2.8 with Super Spectra Coating for film SLRs.
The Canon FD 20mm f/2.8 S.S.C. is a wide-angle prime for Canon's FD-mount film SLR system with Super Spectra Coating (S.S.C.) for improved contrast and flare resistance. The 20mm provides ultra-wide coverage.
Optically good — sharp from f/5.6 with the S.S.C. multi-coating providing better contrast than earlier single-coated FD lenses. The 20mm provides dramatic wide perspectives on 35mm film. Manual focus.
Canon FD mount with S.S.C. multi-coating. Compact design. The FD mount does NOT adapt to Canon EOS without quality-reducing optics. Adapts to mirrorless cameras (Sony E, Fuji X, MFT) via simple adapters.
Available used very cheaply. FD lenses are popular for mirrorless adapting — the 20mm f/2.8 provides budget ultra-wide. Does NOT work on Canon EOS. For FD film shooters or mirrorless adapter enthusiasts.