Which lenses can be used with the Canon EF 1.4x III Extender?
Q. Which lenses can be used with the Canon EF 1.4x III Extender?
"Extender" is Canon’s name for a Teleconverter.
These high-performance accessories multiply the effective focal length of an attached lens by 1.4x or 2x. For example, a 200mm lens with Extender 1.4x has an effective focal length of 280mm: with the Extender 2x, this increases to 400mm.
Extenders are only compatible with selected EF lenses listed in the following chart;