EF 300mm f/2.8L IS II and EF 400mm f/2.8L IS II USM
EF 1.4x III and EF 2.0x III Lens Extenders

Third generation EF Lens Extenders feature completely redesigned optics, coatings and microprocessors to maximize performance when used on Canon Telephoto and Super Telephoto lenses. Water and dust resistant, they feature enhanced durability and strength for rugged professional use in a variety of environments.

  • Optical performance and AF accuracy surpasses current models; specifically designed to minimize chromatic aberrations (“color fringing”) when used
    with compatible Canon EF lenses, especially newest 300mm f/2.8 and
    400mm f/2.8 lenses
  • Built-in Microcomputer enables communications between lens, extender and camera, providing full compatibility with a wide variety of both new, current, and past EF telephoto lenses
  • Compatible with all current and previous Canon EF lenses listed as being officially compatible with Canon-brand tele-extenders
  • Designed for maximum performance and improved AF accuracy when combined with new EF super-telephoto lenses
  • Optimized lens coatings and lens placement to ensure excellent color balance and minimize ghosting and flare; New Fluorine Coating on front and rear elements resists dust, dirt and oil, and makes cleaning much easier
  • Weather-resistant design, with rubber sealing surfaces at front and rear lens mounts, and at lens removal button
  • Enhanced durability and strength — stronger mount design, and reinforced lens locking pin for more secure attachment to master lens
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