Canon EF 2X Teleconverter
The Canon EF 2X III is a lens accessory from Canon — known for its 2x Focal Length Multiplication and Canon EF Mount. Check GearFocus for current availability, with buyer protection on every purchase.
Canon EF 2X Teleconverter
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Overview — Canon EF 2X III
Key Features — Canon EF 2X III
2x Focal Length Multiplication: Doubles the focal length of the attached lens, effectively turning a 300mm into a 600mm for extended telephoto reach.
Canon EF Mount: Fits directly between Canon EF lenses and EF-mount DSLR bodies, maintaining full electronic communication for metering and autofocus.
Autofocus Support: Preserves autofocus operation with compatible Canon EF lenses, avoiding the manual-focus-only limitation of some third-party teleconverters.
2-Stop Light Reduction: Reduces maximum aperture by 2 stops, so a lens at f/2.8 becomes f/5.6 when the converter is attached.
Full-Frame Compatible: Designed for use with full-frame Canon DSLR bodies, covering the entire image circle without vignetting.
Fixed 2x Magnification: Applies a single, consistent multiplication factor rather than a variable range, keeping optical performance predictable.
Specifications — Canon EF 2X III
| 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 value | 325 |
| Weight unit | g |
| Mount lens | Canon EF |
| Compatible Mount | Canon EF |
Description — Canon EF 2X III
The Canon EF 2X Teleconverter is built around the Canon EF mount, making it a direct fit for DSLR camera systems operating in the full-frame format. It supports both autofocus and manual focus, giving photographers the flexibility to work in either mode depending on shooting conditions. The unit is classified as a prime telephoto accessory, applying a fixed extension to the host lens's focal reach.
At 325g, it adds a moderate amount of weight to any lens and body pairing. Image stabilization is listed as None, so photographers relying on optical stabilization should ensure their host lens provides it. The Canon EF mount interface maintains electronic communication between compatible lenses and camera bodies, enabling autofocus operation where the lens and body combination supports it. This teleconverter is a straightforward option for Canon EF system users looking to extend their telephoto capabilities within a familiar mount ecosystem.
Pros — Canon EF 2X III
- ✓Supports both autofocus and manual focus operation, confirmed by focusType field
- ✓Full-frame compatible format, suitable for Canon's complete EF-mount DSLR lineup
- ✓Canon EF mount ensures direct electronic integration with compatible EF lenses and DSLR bodies
Cons — Canon EF 2X III
- ✗No image stabilization — specs explicitly list imageStabilization as None, so the accessory itself adds no optical steadying
- ✗Limited to the Canon EF mount only — not compatible with EF-S, RF, or other mount systems
- ✗Weight of 325g adds noticeable mass to an existing lens and body combination
Reviews — Canon EF 2X III
Videos — Canon EF 2X III
Canon 100-400 vs 70-200 with a 2X Teleconverter — Tony & Chelsea Northrup
Frequently Asked Questions — Canon EF 2X III
What camera mount does this teleconverter use?+
The teleconverter uses the Canon EF mount, as specified in the mount.lens field. It is designed for use with Canon EF-mount DSLR cameras and compatible EF lenses.
Does this teleconverter support autofocus?+
Yes. The specifications confirm that autofocus is supported, and the focusType field lists both Auto and Manual as available focus modes.
Is this teleconverter compatible with full-frame cameras?+
Yes. The lensFormat specification is listed as Full Frame, and the cameraSystem field confirms compatibility with DSLR bodies.
How much does this teleconverter weigh?+
The teleconverter weighs 325g according to the weight specification. This is worth factoring in when planning a full lens and body kit for field use.
Does this teleconverter include image stabilization?+
No. The imageStabilization field is explicitly listed as None, meaning the teleconverter itself does not contribute any optical stabilization. Any stabilization would need to come from the attached lens or camera body.