Canon Extender EF 1.4X III: Optimized Telephoto Reach

The Canon Extender EF 1.4X III is a third-generation teleconverter designed to increase the focal length of compatible Canon EF telephoto and telephoto zoom lenses by a factor of 1.4x, with only a one-stop reduction in the effective aperture. This extender is highly regarded for its robust construction, improved optical performance, and advanced communication features, making it a crucial accessory for professional sports, wildlife, and nature photographers.

Key Features:

• 1.4x Magnification Factor: Increases the focal length of the primary lens by 40%. For example, turning a 300mm lens into a 420mm lens.

• One-Stop Aperture Reduction: The use of the extender results in a one-stop decrease in the effective maximum aperture. For example, an f/2.8 lens becomes an f/4 lens.

• Advanced Optical Design:

  • Features 7 elements in 3 groups, ensuring high image quality across the entire image area.

  • Includes a carefully positioned aspherical element (in the third group) to minimize chromatic aberration and distortion, especially at the edges.

  • Optimized lens coatings—including Canon's Super Spectra Coating—are used to minimize ghosting and flare that can occur when using extenders.

• Enhanced Communication: Features a built-in micro-computer that provides improved communication between the lens and the camera body. This optimizes Auto Exposure (AE) and Auto Focus (AF) performance and ensures accurate recording of Exif data (correct focal length and aperture).

• Robust and Professional Construction:

  • Built to the rigorous standards of Canon's L-series lenses.

  • Highly resistant to dust and moisture, making it suitable for professional use in challenging outdoor environments.

• Fluorine Coating: The front and rear elements feature a fluorine coating, which helps to reduce smudges, fingerprints, and dirt, making the lens easier to clean.

• Compatibility: Designed to work specifically with a wide range of Canon EF telephoto and telephoto zoom lenses, maintaining superior image quality. Note: It is not compatible with all EF lenses; compatibility depends on the rear element clearance.

Benefits:

• Extended Reach: Dramatically increases your telephoto capabilities without the need to carry a separate, longer, and heavier lens.

• High Image Quality: The advanced optical formula ensures that sharpness and contrast remain excellent, minimizing the typical quality degradation associated with extenders.

• Professional Reliability: Its weather-sealed construction guarantees performance and longevity, matching the durability of professional L-series lenses.

• Precise AF/AE: The integrated processor ensures that the camera's focusing and exposure systems function optimally, even with the extended focal length.

The Canon Extender EF 1.4X III is an essential piece of equipment for photographers who require the flexibility to quickly extend their focal length while maintaining the highest possible image quality.