Canon Extender EF 2x II Teleconverter
The Canon 2x II is a lens accessory from Canon — known for its 2x Focal Length Multiplication and Canon EF Native Mount. Used copies start from $175.9 on GearFocus, with buyer protection on every purchase.
Canon Extender EF 2x II Teleconverter
Used Canon 2x II Listings on GearFocus
Overview — Canon 2x II
Key Features — Canon 2x II
2x Focal Length Multiplication: Doubles the effective focal length of the attached lens, extending telephoto reach without purchasing an additional long lens.
Canon EF Native Mount: Fits directly between Canon EF lenses and EF-mount DSLR bodies for seamless native system integration.
Autofocus Support: Retains autofocus capability with compatible Canon EF lenses, though AF performance depends on the maximum aperture of the attached lens.
2-Stop Light Reduction: A 2x teleconverter reduces the effective maximum aperture by 2 stops, which affects exposure and autofocus availability in lower light.
Full-Frame Coverage: Designed to cover the full-frame imaging circle, making it suitable for use on both full-frame and APS-C Canon DSLRs.
Compact Build: Adds minimal weight to an existing lens-and-body combination, keeping the kit manageable for handheld shooting.
Specifications — Canon 2x 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 | 265 |
| Mount lens | Canon EF |
| Compatible Mount | Canon EF |
Description — Canon 2x II
The Canon Extender EF 2x II Teleconverter is built around the Canon EF mount and designed specifically for DSLR camera systems. It supports a full-frame lens format, making it a fit for Canon's full-frame EF body lineup. The extender covers a telephoto focal length range classification and carries a prime designation.
Both autofocus and manual focus are supported, giving shooters the ability to use native AF performance where the attached lens and body allow, or to switch to manual focus when needed. The accessory weighs 265g, adding a relatively contained amount of weight to an existing lens and body setup. Image stabilization is not present in the extender itself, so any optical stabilization in your system will depend on the attached lens. There is no listed filter thread size for this unit.
For Canon EF DSLR shooters looking to extend the reach of compatible telephoto lenses, this extender provides native mount integration with focus mode flexibility.
Pros — Canon 2x II
- ✓Supports both autofocus and manual focus, offering flexibility across different shooting scenarios
- ✓Native Canon EF mount ensures direct compatibility with Canon EF DSLR system
- ✓Full-frame format support means no imaging circle concerns when used with full-frame bodies
Cons — Canon 2x II
- ✗No image stabilization built in — reliant entirely on the attached lens for any IS
- ✗Maximum aperture is not specified in available data, making light-loss impact harder to assess from specs alone
- ✗No filter thread size listed, so front-of-extender filter use is not confirmed
Reviews — Canon 2x II
Videos — Canon 2x II
Canon 100-400 vs 70-200 with a 2X Teleconverter — Tony & Chelsea Northrup
Frequently Asked Questions — Canon 2x II
What camera mount does this teleconverter use?+
The Canon Extender EF 2x II uses the Canon EF mount, making it compatible with Canon EF lenses on DSLR camera bodies. It is listed for DSLR systems and is not specified for mirrorless mounts.
Does this teleconverter support autofocus?+
Yes, autofocus is supported. The extender also supports manual focus, so shooters can use either focusing method depending on their preference or the demands of their subject.
Is image stabilization included in the teleconverter itself?+
No, image stabilization is listed as none for this accessory. Any stabilization available in your setup will come from the lens you attach it to, not the extender itself.
How much does the extender weigh?+
The extender weighs 265g. This is worth accounting for when calculating the total weight of your lens and camera combination, particularly for handheld shooting over longer periods.
Is this extender suitable for full-frame cameras?+
Yes, the lens format is specified as full frame, so it is designed to work with full-frame Canon EF DSLR bodies without imaging circle limitations.