SUMMARY
A significant compatibility problem within Canon's lens system, which he describes as a crucial missing piece. This issue can render certain used Canon lenses effectively worthless. The problem stems from the communication between newer camera bodies and older lens designs, impacting their functionality and value.
TAKEAWAYS
Canon lenses may have a crucial compatibility issue.
Some used Canon lenses could be worthless due to this problem.
The issue affects communication between camera bodies and lenses.
This oversight impacts lens functionality and value.