The Canon Extender EF 2X III is a powerful teleconverter designed to dramatically increase the reach of compatible Canon EF lenses. For tourists in Japan needing extreme telephoto capabilities for wildlife, distant landscapes, or sports, this accessory effectively doubles the focal length of the master lens.
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Contact Jasumo Now →Engineered to maintain the optical integrity of high-quality L-series lenses, the EF 2X III minimizes optical degradation and reduces flare through advanced internal treatments. Like its counterpart, it features robust weather-resistant and dust-resistant construction, making it suitable for demanding super-telephoto photography in all types of Japanese environments.
Renting the EF 2X III offers unparalleled telephoto reach without the expense or bulk of a dedicated, extremely long lens. It is perfect for capturing intimate, frame-filling images of elusive Japanese wildlife or isolating small details of scenery from a great distance.
The Canon Extender EF 2X III incorporates 9 elements in 5 groups in its design, carefully matched to Canon’s professional telephoto lenses to ensure excellent performance. The construction is focused on minimizing flare and ghosting, preserving the contrast and resolution of the images, a critical factor when doubling the focal length.
Its environmental sealing is a major advantage for travel photography. When used with sealed L-series lenses and weather-resistant EOS camera bodies, this extender forms a reliable system that keeps rain and dust out, enabling you to shoot in more challenging conditions you might encounter across Japan.
It is important to note that when attached, the effective maximum F-number is reduced by two stops (e.g., an F2.8 lens becomes F5.6; an F4 lens becomes F8). This reduction in light may restrict autofocus functionality depending on your camera model and the master lens’s original aperture, potentially requiring manual focus.
| Feature | Specification |
| Model Number | EF2X3 |
| Lens Construction | 9 elements in 5 groups |
| Magnification | 2 times |
| Mass | 325 grams |
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While the 2X extender offers more magnification, it has a slightly higher impact on image quality than the 1.4X extender due to the greater enlargement. However, when paired with high-quality L-series prime lenses, the results remain exceptionally sharp and clear.
When attached to an F4 lens (like the EF 300mm F4L), the effective maximum aperture is reduced by two stops, making it F8. This is a crucial point because AF capability may be lost on many camera bodies when the aperture is F8 or dimmer.
Autofocus is only guaranteed on camera bodies that support AF at an effective maximum aperture of F8 or dimmer. If your master lens is F4 (resulting in F8) or F5.6 (resulting in F11.2), you may need to use manual focus. Check your camera’s AF capabilities at F8.
Given that the focal length is doubled (e.g., a 300mm lens becomes 600mm) and the aperture is smaller, camera shake is significantly magnified. A sturdy tripod or monopod is highly recommended for all shooting, especially in low light, to ensure maximum sharpness.
Yes, due to its protruding front element and specialized optical design, the Extender is only compatible with a select list of Canon EF telephoto primes (e.g., 135mm and longer) and some telephoto zooms. It cannot be used with standard zoom or wide-angle lenses.
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