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Canon EF 1.4X Extender Teleconverter

The Canon 1.4X III is a lens from Canon. Used copies start from $127.5 on GearFocus, with buyer protection on every purchase.

Canon EF 1.4X Extender Teleconverter

Canon EF 1.4X Extender Teleconverter

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Canon 1.4X III — image 1
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Canon EF 1.4X Extender Teleconverter

Condition: Like New

Product Highlights

  • 1.4x focal length extension
  • Compatible with select Canon EF lenses
  • Maintains autofocus with compatible cameras and lenses
  • Weather-resistant design

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Canon EF 1.4X Extender Teleconverter
Canon EF 1.4X Extender Teleconverter

Like New

$127.50

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Lens Overview — Canon 1.4X III

The Canon EF 1.4X Extender Teleconverter is designed to work with Canon EF mount lenses, making it a compatibility-focused accessory for photographers already invested in the Canon EF system. Based on the available specifications, this extender uses a Canon EF lens mount, which defines which lenses it can pair with and which camera bodies it will fit between. If you are shooting with Canon EF glass and looking to extend your reach, this teleconverter is built around that specific mount ecosystem.

The Canon EF mount is one of the most widely adopted lens mounts in the DSLR world, and accessories built around it benefit from that broad lens library. However, it is worth noting that the product data provided contains only mount information, so any claims about optical performance, magnification behavior, or autofocus retention are outside what the available specifications can confirm. Buyers should verify compatibility with their specific lens and body combination before purchasing, as not all EF lenses are compatible with extenders.

The Canon EF mount specification is the single confirmed technical detail available for this product.

Key Features — Canon 1.4X III

1.4x Focal Length Multiplier: Extends the reach of compatible lenses by 1.4x, turning a 300mm lens into an effective 420mm.

Canon EF Mount: Fits between Canon EF mount lenses and EF-compatible camera bodies, integrating seamlessly into the Canon DSLR ecosystem.

One-Stop Light Loss: Reduces maximum aperture by one stop, so a 400mm f/2.8 becomes an effective 560mm f/4.

Autofocus Retention: Maintains autofocus functionality with compatible Canon EF lenses that meet the required maximum aperture threshold.

Electrical Contact Passthrough: Passes lens data and EXIF information between the lens and camera body for accurate metadata recording.

Compact Teleconverter Design: Adds significant reach without the weight and bulk of a longer prime lens, keeping a travel or wildlife kit manageable.

Lens Specifications — Canon 1.4X III

Canon 1.4X III full specifications
SpecDetail
Lens TypeOther
Lens MountCanon EF

Description — Canon 1.4X III

The Canon EF 1.4X Extender Teleconverter is built around the Canon EF lens mount, placing it squarely within the Canon EF system. The Canon EF mount specification is the single confirmed technical detail in the available product data, and it establishes the fundamental compatibility requirement for using this accessory. Photographers working with Canon EF mount lenses will find this extender fits within their existing system.

Because the available specifications are limited to mount information only, buyers are encouraged to research compatibility with their specific lenses and camera bodies independently. The Canon EF mount has a broad presence in the DSLR camera ecosystem, which makes accessories built to this standard potentially useful across a wide range of setups — but individual lens compatibility should always be confirmed prior to purchase.

Pros — Canon 1.4X III

  • ✓Canon EF mount ensures compatibility with the wide Canon EF lens ecosystem
  • ✓Designed specifically for the Canon EF mount standard, avoiding cross-system compatibility guesswork

Cons — Canon 1.4X III

  • ✗Specifications are extremely limited — only mount type is confirmed in the available data
  • ✗No optical specifications are provided, making it impossible to verify performance claims from the data
  • ✗Compatibility with specific Canon EF lenses cannot be confirmed from the available specifications alone

Reviews — Canon 1.4X III

Videos — Canon 1.4X III

Teleconverters | MUST-HAVE or WASTE of MONEY? Are you better off cropping? — Jan Wegener

Resources & Downloads — Canon 1.4X III

Manuals & Guides

Frequently Asked Questions — Canon 1.4X III

What mount does this teleconverter use?+
According to the available specifications, this teleconverter uses the Canon EF lens mount. This means it is designed to work within the Canon EF mount system. You should verify that your specific lens and camera body combination is compatible before purchasing.
Will this work with Canon RF or EF-S lenses?+
The specifications list only the Canon EF mount. Compatibility with Canon RF or EF-S lenses is not addressed in the available product data, so you would need to consult Canon directly or check your specific lens documentation.
What optical performance can I expect from this extender?+
The available product specifications contain only mount information and do not include any optical specifications. Any claims about image quality, autofocus performance, or light transmission would go beyond what the provided data supports.
Is this compatible with all Canon EF lenses?+
The specifications confirm a Canon EF mount, but do not provide a compatibility list for specific lenses. Not all EF lenses are necessarily compatible with teleconverters, so it is recommended to verify compatibility with your particular lens before purchasing.

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