Mirror strike was revisited in the 21th century when people started attaching alternative lenses to DSLRs. Even when the registration distance was compatible, the lens could protrude too deeply into the mirror box. Solutions included shaving the lens, shaving the mirror, and even using pre-fire to mount the lens (and allowing the mirror to land on top of the lens). The latter approach meant losing TTL functions, but we suffer for our art, right?