Les Sarile
Member
Long term the problem is AF film technology is stuck in the new millennium at best, while digital auto focus advances continue apace.
I can tell you with confidence in years of use - dark settings and fast action tracking, that the AF in the EOS1V & 3 + L lenses worked instantaneously and uneventfully. The manual focus override on the lenses are quite useful too. The bodies will not need an upgrade and the focus motors are in the lenses. For that matter, there are no dslrs that have ECF.