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Canon EF 1.4x III Extender

Multiplies select telephoto lens's focal-length by 1.4X

Item #: 280EF14X

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Get some extra versatility from your telephoto L-Series lens with this precision-designed 1.4X extender. Your 300mm lens, for example, will gain 40% more reach, with a resulting focal length of 420mm (on full-frame cameras) or 672mm (on APS-C sensor cameras) once this extender has been placed in the light path. And it will only give up one stop of light sensitivity in the process. It's like getting two lenses out of your kit bag when this extender is standing at the ready.

A built-in microcomputer facilitates communication between lens, extender, and camera body, and provides fully integrated exposure and focus control on many Canon lenses. Not all lenses will be fully compatible though, so you should check your manuals and the Canon website to make sure of your lens's compatibility with this extender.

Fluorine coatings on the extender's optical elements will keep soils, smearing and fingerprints to a minimum. And it features rugged dustproof and water-resistant construction.

Product Highlights:

  • increases focal length by 1.4X on select Canon L-series telephoto lenses
    • example: a 300mm prime lens will have its reach extended to 420mm while only losing one stop of sensitivity
    • multiply your lens's focal length by 1.4 to see the resulting focal length when this lens is placed in-line on a full frame camera
    • then multiply that result by 1.6 to see your effective focal length on Canon APS-C cameras
  • rugged dustproof and water-resistant construction
  • on-board microcomputer regulates communication between camera, extender, and lens
  • 7 elements in 3 groups
  • only compatible with select L-Series lenses; not all automatic functions will be accessible on all lenses, consult manuals and Canon's website for compatibility info
  • 2-7/8" (diameter) x 1-5/8" (length)
  • 7.9 ounces
  • warranty: 1 year
  • Our 60-day money-back guarantee

Canon EF 1.4x III Extender Reviews

Average Customer Review:

4 Reviews

Awesome for that extra reach

Written by: Noah from Massachusetts on November 1, 2015

Crutchfield Customer Review (What's this?)

I can't compare this extender to its predecessor but paired with the Canon 7D Mark II and the new 100-400mm 4.5-6.3 IS II, it does an awesome job. It retains autofocus on the center focal point, as advertised, and produces sharp images even at 400mm in moderate lighting conditions.

Pros: Great focusing for an extender Sharp images Compact


Great Product; Expensive

Written by: SteveR from New York on April 29, 2015

Crutchfield Customer Review (What's this?)

This is a great product. The photos are sharp and focusing remains quick and accurate (assuming lens compatibility). However, the final cost of additional reach is quite expensive and perhaps not worth the hefty price tag to gain that extra zoom unless it's exactly what you need.

Pros: quick, sharp focus, small, portable

Cons: expensive for the total value that it brings


Written by: JUNIOR from MURFREESBORO, TN. on March 15, 2014



Cons: NONE

Canon 1.4x III

Written by: larry from Westminster, CO on November 18, 2013

Crutchfield Customer Review (What's this?)

Great addition to any prime lens.

Pros: Works great

Cons: None

Hands-on research

What's in the box?

Download owner's manual

  • Extender EF1.4x III lens adapter
  • Front body cover (installed)
  • Rear lens cap (installed)
  • Lens Case LP811
  • Quick Guide
  • Warranty Card

Product Research


Overview: The Canon Extender 1.4x III will extend the focal length of a lens by a factor or 1.4x. It has a standard Canon EF-mount, and is compatible with many L-series Canon EF lenses (see list below). It features 7 elements in 3 groups, and comes with a soft LP811 lens case.

Compatibility: The Extender 1.4x III is compatible with the following Canon lenses:

Compatible Lens Focal Length and Maximum Aperture with EF1.4x III
EF135mm f/2L USM 189mm f/2.8
EF180mm f/3.5L Macro USM 252mm f/4.5
EF200mm f/2.8L USM 280mm f/4
EF200mm f/2.8L II USM 280mm f/4
EF200mm f/1.8L USM 280mm f/2.5
EF200mm f/2L IS USM 280mm f/2.8
EF300mm f/4L USM 420mm f/5.6
EF300mm f/4L IS USM 420mm f/5.6
EF300mm f/2.8L USM 420mm f/4
EF300mm f/2.8L IS USM 420mm f/4
EF400mm f/5.6L USM 560mm f/8
EF400mm f/4 DO IS USM 560mm f/5.6
EF400mm f/2.8L USM 560mm f/4
EF400mm f/2.8L II USM 560mm f/4
EF400mm f/2.8L IS USM 560mm f/4
EF500mm f/4.5L USM 700mm f/6.7
EF500mm f/4.5L IS USM 700mm f/5.6
EF600mm f/4L USM 840mm f/5.6
EF600mm f/4L IS USM 840mm f/5.6
EF800mm f/5.6L IS USM 1120mm f/8
EF100-400mm f/4.5-5.6L IS USM 140-560mm f/6.7-8
EF70-200mm f/4L USM 98-280mm f/5.6
EF70-200mm f/4L IS USM 98-280mm f/5.6
EF70-200mm f/2.8L USM 98-280mm f/4
EF70-200mm f/2.8L IS USM 98-280mm f/4
EF70-200mm f/2.8L IS II USM 98-280mm f/4
EF300mm f/2.8L IS II USM 420mm f/4
EF400mm f/2.8L IS II USM 560mm f/4
EF500mm f/4L IS II USM 700mm f/5.6
EF600mm f/4L IS II USM 840mm f/5.6
EF1200mm f/5.6L USM 1680mm f/8

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

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Why did you buy this?

Great addition for adding a bit more zoom for wildlife photos with the EF 70-200 mm lens [ Robert  Jan 20, 2016 ]

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