Canon's generic 28mm f/2.8 — likely FD mount without specific S.S.C. or New FD designation.
The Canon 28mm f/2.8 without specific mount or coating designation could be an FD, New FD, or EF-mount lens — the canonical name is ambiguous. The 28mm f/2.8 was produced across multiple Canon mount generations.
The optical quality varies by specific mount version — EF (ID 564) is autofocus, FD (ID 1310) is manual. All versions provide 28mm wide-angle at f/2.8. Check the specific mount type on any used purchase.
Mount and version must be verified — could be FD breech-lock, New FD bayonet, or EF mount. The 28mm f/2.8 specification spans Canon's history. Filter thread varies by version.
Check specific mount and version before purchase. Available used very cheaply regardless of version. See IDs 564 (EF) and 1310 (FD) for mount-specific details. The ambiguous canonical name requires verification.