Many camera companies changed mounts suddenly, canon was just the biggest with the most lenses so it caused more uproar. For the pro's with significantly large lenses like 400mm or 600mm primes, canon offered a send in program where they would change the mount for you. Also they offered a conversion adapter on a limited basis. I've only seen one on eBay once, and if memory serves they made a tiny run like 200 that were made. They only fit the L series glass and possibly only the white lenses as the adapter is white.
Originally Posted by John Koehrer
It's just like the ones with cheap glass on eBay except its high quality canon glass.
Wish I could get my hands on one...
~Stone | Sent w/ iPhone using Tapatalk