Canon Extender EF 2X III

Canon Extender EF 2X III
The Canon Extender EF 2X III is a high-performance teleconverter designed to double the reach of select Canon L-series telephoto lenses. By increasing your focal length by a factor of 2x, this extender allows you to get remarkably close to distant action—whether it’s a rare bird in the canopy or an athlete across the field—without the weight and expense of an additional super-telephoto lens. Built to professional standards, the Mark III version features redesigned optics and enhanced data communication to ensure your images remain sharp, balanced, and professional.

Professional Optics & Performance
Double the Focal Length: Instantly transform a 200mm lens into a 400mm, or a 300mm into a 600mm. This is an essential tool for wildlife, nature, and sports photographers who need maximum reach.

Redesigned Optical Layout: Featuring nine optical elements in five groups, the Mark III offers superior image quality and minimized aberrations compared to its predecessors.

Super Spectra & Fluorine Coatings: Every element is treated with Super Spectra coating to eliminate ghosting and flare. Additionally, Fluorine coatings on the front and rear surfaces repel fingerprints and water spots, making the glass much easier to clean in the field.

Integrated Micro-Processor: A built-in processor facilitates seamless communication between the lens and camera body. This ensures that all metering, autofocus, and EXIF ID information is accurately transferred for reliable performance.

Built for the Elements
Weather-Sealed Construction: Matching the build quality of Canon’s premium L-series glass, this extender is fully resistant to dust and water. It is designed to perform reliably in the extreme environments often encountered by photojournalists and nature photographers.

Durable & Secure Mounting: A carefully positioned lens release mechanism allows for rapid mounting and dismounting, minimizing the time your camera sensor is exposed to the elements.

Aperture & AF Note: When attached, the 2x extender reduces the effective maximum aperture by two stops. For example, an f/2.8 lens becomes an f/5.6. Autofocus remains fast and accurate when paired with compatible high-end L-series lenses.

Compatibility
Note: This extender is designed specifically for L-series telephoto lenses and is not compatible with standard EF or EF-S lenses.

Fixed Focal Length: L-series lenses 135mm and over.

Zoom Lenses: All versions of the EF 70-200mm f/2.8L, EF 70-200mm f/2.8L IS, EF 70-200mm f/4L, and the EF 100-400mm f/4.5-5.6L.

Technical Specifications
Magnification: 2.0x

Aperture Loss: 2 Stops

Lens Mount: Canon EF

Lens Construction: 9 Elements in 5 Groups

Weight: Approx. 11.5 oz (325 g)