AF sensors have to be designed very explicitly, and as CMOS devices, must be designed flat themselves,” jrista wrote on StackExchange in 2012. “I guess it might be possible to create an AF unit that had multiple AF sensors that functioned on different focal planes, allowing points from various AF sensors at differing focal planes to be utilized in some sort of three-dimensional AF phase detection algorithm. Such technology would be radically complex and radically expensive, assuming the theory really even holds any water in the first place — my guess is that would only allow AF when tilt lines up usefully on whatever focal plans the AF sensors support, and not anywhere else… making it non-viable.”A lot has changed since this response was initially written and technological improvements in cameras have moved forward by leaps and bounds, so it is possible that Canon has figured out how to implement autofocus in a lens that doesn’t maintain a flat focal plane. Canon actually filed a patent for such a lens back in 2016.The five years since that filing would have given the company plenty of time to actually produce it. For now, though, its release remains speculation.
Espaço Canon