A study in different concepts: Nikon's backward compatibility combines their classic mechanic mount with electronic coupling, versus Canon's completely new design of their EF mount without any mechanic elements.

Back than sceptics considered Canon's move away from FD mount reckless. Now, almost 20 years after the introduction of the EF mount we know whose concept won the preference of the professional photographers! Nikon is forced to follow Canon! The former undisputed 'Number One' lost a majority of its base in pro applications. Finally after years of delay, Nikon released a new "G" series of lenses with VR, which can really challenge Canon.