Canon Extender EF 1.4x II Teleconverter
The Canon 1.4x II is a lens accessory from Canon — known for its 1.4x Focal Length Extension and Autofocus Compatible. Used copies start from $147.97 on GearFocus, with buyer protection on every purchase.
Canon Extender EF 1.4x II Teleconverter
Used Canon 1.4x II Listings on GearFocus
Overview — Canon 1.4x II
Key Features — Canon 1.4x II
1.4x Focal Length Extension: Multiplies the focal length of compatible Canon EF lenses by 1.4x, providing additional reach without changing lenses.
Autofocus Compatible: Retains autofocus functionality with supported Canon EF telephoto lenses, keeping AF-driven workflows intact.
Canon EF Mount: Fits between the camera body and compatible Canon EF lenses, integrating directly into the existing EF lens ecosystem.
Full Frame Coverage: Designed to cover full frame sensors with no vignetting when used with compatible lenses.
1-Stop Light Loss: Reduces maximum aperture by one stop — a 300mm f/2.8 becomes a 420mm f/4 — which should be accounted for in exposure settings.
Lightweight at 220g: Adds only 220g to a telephoto setup, keeping the overall kit weight manageable for extended field use.
Specifications — Canon 1.4x II
| Spec | Detail |
|---|---|
| Lens Format | Full Frame |
| Camera System | DSLR |
| Zoom Prime | Prime |
| Auto Focus | Yes |
| Focus Type | Auto, Manual |
| Focal Length Range | Telephoto |
| Image Stabilization | None |
| Weight unit | g |
| Weight value | 220 |
| Mount lens | Canon EF |
Description — Canon 1.4x II
The Canon Extender EF 1.4x II is a Canon EF mount teleconverter built for DSLR camera systems with full frame sensor coverage. It operates in the telephoto focal length range and supports both Auto and Manual focus, giving photographers flexibility in how they operate their autofocus system when the extender is in use. Weighing 220g, it is a compact and manageable addition to a telephoto lens kit.
The extender carries no image stabilization of its own, which is standard for accessories of this type. With its Canon EF lens mount, it is purpose-built to integrate with Canon's EF lens lineup on compatible DSLR bodies, making it a straightforward option for photographers looking to extend the reach of their existing Canon EF telephoto glass.
Pros — Canon 1.4x II
- ✓Autofocus supported — both Auto and Manual focus modes available per specs
- ✓Full frame coverage ensures compatibility with Canon EF full frame bodies
- ✓Lightweight at only 220g, adding minimal weight to a telephoto lens combination
Cons — Canon 1.4x II
- ✗No image stabilization on the extender itself (listed as None in specs)
- ✗Filter thread size is unspecified, limiting stackable accessory planning
- ✗Compatible only with Canon EF mount — no support for other lens mounts
Reviews — Canon 1.4x II
Videos — Canon 1.4x II
Teleconverters | MUST-HAVE or WASTE of MONEY? Are you better off cropping? — Jan Wegener
Frequently Asked Questions — Canon 1.4x II
Does this extender support autofocus?+
Yes. The specifications confirm autofocus is supported, with both Auto and Manual focus listed as available focus types. AF performance will depend on the host lens and camera body combination.
What lens mount does this extender use?+
The Canon Extender EF 1.4x II uses the Canon EF mount, as specified in the mount data. It is designed for Canon EF lenses on DSLR camera systems.
Does this extender cover full frame sensors?+
Yes. The lensFormat specification lists Full Frame, meaning it is designed to provide coverage for full frame sensor cameras.
How much does the extender weigh?+
The extender weighs 220g according to the specifications. This makes it a relatively lightweight addition to a telephoto lens and camera setup.
Does the extender have image stabilization?+
No. The imageStabilization field in the specifications is listed as None. Any image stabilization present in a compatible host lens would be unaffected by this, but the extender itself contributes no IS functionality.