Has Canon Discontinued This Iconic Telephoto Lens?

Canon has introduced some popular lenses over the years. The company has a wide range, catering from fisheye lenses to some truly iconic telephoto lenses and zooms. While they moved to the mirrorless mount less than a decade ago, their older lenses, for the EF mount, continue to be hailed by professionals around the globe. It now appears that one such telephoto lens is biding goodbye, which is truly saddening for those who like EF lenses.