Originally posted by stevebrot Strangely, Nikon offers full backward compatibility on the dF and significant backward compatibility for all AIS back to the mid-1970s on their upper tier models. Even stranger...they still sell some of those manual focus lenses.
Steve
When Nikon introduced autofocus, they did so with their existing F mount. They've added electronic connections, but the physical mount has remained the same since 1958, making compatibility easier to maintain. Nikon only moved to a new mount with their Z-series mirrorless cameras.
Canon, on the other hand, ditched their FD mount in favor of the all-electronic EF mount when they started introducing autofocus in their film SLRs. The new mount's wider diameter and shorter flange distance, in addition to its different bayonet mount, required an adapter for FD lenses to work on the then-new EF bodies.