Description
Canon Extender RF 1.4x III: Extend Your Reach with Minimal Image Quality Impact
The Canon Extender RF 1.4x III is a high-performance teleconverter designed to increase the focal length of compatible Canon RF mount lenses by a factor of 1.4x. This allows photographers to gain valuable extra reach for capturing distant subjects, making it an excellent tool for wildlife, sports, and nature photography while maintaining impressive image quality.
Engineered with precision optics, the Extender RF 1.4x III incorporates high-quality glass elements designed to minimize aberrations and maintain the sharpness and clarity of the primary lens. Canon’s advanced lens coatings are applied to reduce ghosting and flare, ensuring high contrast and accurate color rendition even when using the extender.
This teleconverter seamlessly integrates with select Canon RF lenses, preserving full communication between the lens and the camera body. This crucial integration ensures that essential functions like autofocus, metering, and Image Stabilization (IS) remain fully operational. The extender also accurately transmits Exif data, providing detailed information about your shooting parameters.
Built to withstand the rigors of professional use, the Extender RF 1.4x III features a dust- and water-resistant construction. This allows photographers to confidently shoot in challenging environmental conditions without worrying about compromising their equipment. The exterior of the extender is finished with a white heat shield coating, similar to that found on Canon’s high-performance RF telephoto lenses, which helps to prevent overheating and maintain consistent performance even in high temperatures.
For specific compatibility with the RF 100-500mm F4.5-7.1L IS USM lens, the extender features a built-in mechanism that limits the zoom range to 300-500mm when attached.5 This prevents the lens elements from colliding and ensures safe operation.
The Canon Extender RF 1.4x III is a reliable and high-quality accessory for photographers looking to extend the focal length of their compatible RF lenses while minimizing any potential impact on image quality and retaining essential camera and lens functionalities.
Key Features:
- Increases the focal length of compatible Canon RF lenses by 1.4x.
- Maintains autofocus, metering, and Image Stabilization (IS) functionality.
- High-quality optical design for minimal image degradation.
- Advanced lens coatings to reduce ghosting and flare.
- Dust- and water-resistant construction for durability.
- Heat shield exterior coating for stable performance in various temperatures.
- Seamless integration with select RF lenses, including zoom range limitation with the RF 100-500mm.
- Full electronic communication between lens and camera for accurate data transmission.
Focal length extension for super-telephoto lenses
The Extender EF 1.4x III is specially designed to work in conjunction with L-series IS super-telephoto lenses, extending their focal length by a factor of 1.4x. The extender’s design ensures there is no loss of lens performance or image quality.
High-quality construction
Improved anti-reflection materials inside the lens-barrel and a coating around the outer edges of the lens elements reduce flare. Construction is resistant to dust and water, helping to maintain images quality.
Improved communication between lens and camera
A built in microprocessor provides accurate transfer of data from between the lens and camera delivering an improved performance in AF and metering.
Compatible with L-Series telephoto and telephoto zoom lenses
The Extender EF 1.4x III is compatible with most telephoto and telephoto zoom lenses within Canon’s flagship professional L-series range, extending the focal length while only reducing the effective aperture of the lens by one stop.


