03-07-2018 09:15 PM
L = Canon "L" series lenses -- widely accepted that "L" stands for "Luxury" though I don't think I've ever actually found an explanation in Canon documentation. I've also never seen any alternate explanation of what "L" stands for.
I believe Ken Rockwell says the L stands for Expensive as 'L'. ;-)
When EF is translated into Japanese, Google Translater makes it sound like “ EL “.