Theo Sulphate
Member
It's not the same mount in reality though. It's a minefield as to what lens works with which camera (and which features work).
In retrospect, Canon got it right. Any EF mount lens will fully work with any EOS camera, whether that be film, digital full frame or digital APS-C.
Totally agree with you about Canon getting it right ... although back in 1987 there were quite a few upset customers.
As for Nikon, someone (KR?) pointed out that for any given camera or lens there is a roughly 15 year window of total compatibility backwards and forwards. You can see that in KR's excellent compatibility chart, which is now halfway down the page:
https://www.kenrockwell.com/nikon/compatibility-lens.htm