Canon EF to PL, Is it Possible?

Matthew Duclos of Duclos Lenses talks about the issues with converting non-PL mount lenses to PL. He says, "Sure, it’s possible. But it’s also possible to put a Ferrari motor into a
Hyundai. I guarantee it would be cheaper, quicker, more reliable, and
all around easier to simply purchase a brand new Ferrari than it would
be to custom install a Ferrari motor into a little Hyundai. The same
goes for PL mounts on still lenses."

Read his full post here.