Canon EF 4409B002 - Teleconverter Lens

The Canon EF 4409B002 Teleconverter Lens, part of Canon’s Extender EF 1.4x III family, is crafted for photographers who demand more reach without sacrificing optical quality. This 1.4x extender sits between the camera body and a compatible Canon EF lens, extending focal length by a factor of 1.4x and enabling dramatic framing, tighter compositions, and new storytelling possibilities. Built to complement Canon’s renowned super telephoto lenses, this extender preserves sharpness, contrast, and autofocus performance across a wide range of shooting scenarios, from high-speed wildlife to fast-moving sports. Its modern microprocessor communicates seamlessly with both lens and camera body, helping to maintain accurate metering, AF behavior, and exposure settings so you can focus on composition rather than technical adjustments.

• Expanded focal length for reach and perspective: The Extender EF 1.4x III adds 1.4x magnification to compatible Canon EF lenses, letting you frame distant subjects with greater intimacy without swapping lenses or altering your shooting position.
• Sharp, high-contrast image quality with minimized chromatic aberration: Canon’s optical engineering minimizes color fringing and maintains crisp detail across the frame, so wildlife textures, feather details, and fur patterns stay vibrant in every frame.
• Preserved communication and reliable autofocus: The built-in microcomputer enables seamless data exchange between camera, teleconverter, and compatible lens, helping to preserve AF performance, metering accuracy, and exposure consistency in demanding conditions.
• Designed to complement Canon super telephoto lenses: This teleconverter is optimized for use with Canon’s line of long-telephoto lenses, delivering a practical solution for photographers who need extra magnification without carrying heavy, dedicated prime lenses.
• Simple, user-friendly integration and operation: Quick mounting and compatibility with a wide array of EF lenses mean you can quickly adapt to changing scenes, capture spontaneous moments, and maintain your workflow with minimal downtime.

Technical Details of Canon EF 4409B002 Teleconverter Lens

• Magnification: 1.4x ( Extender EF 1.4x III)
• Mount: Canon EF on both camera side and lens side, designed for use between camera body and compatible EF lenses
• Compatibility: Works with select Canon EF lenses and Canon EOS bodies that support Extender EF 1.4x III functionality
• Communication: Built-in microprocessor for seamless camera–teleconverter–lens data exchange, supporting accurate exposure, metering, and AF behavior
• Optical performance: Engineered to minimize chromatic aberration and preserve image quality when combined with compatible telephoto optics
• Construction: Robust build designed to withstand field use and match the durability expectations of Canon’s telephoto ecosystem

How to install Canon EF 4409B002 Teleconverter Lens

• Turn off the camera and remove the current lens to prepare for teleconverter installation.
• Attach the teleconverter to the camera body by aligning the red dot or alignment mark on the teleconverter with the camera’s lens mount and rotate until it locks into place.
• Line up the rear mount of your EF lens with the front mount of the teleconverter and attach the lens to the teleconverter in the same manner, ensuring a secure connection.
• Power on the camera and verify that autofocus, metering, and exposure behave normally with the attached lens and teleconverter. Some combinations may reduce AF speed or require the camera to adjust focus more gradually.
• Check for any compatibility notices in the camera’s display. If AF or metering becomes inconsistent, remove and reattach the lens and teleconverter in the correct order or consult Canon’s compatibility guides for your specific lens model.

Frequently asked questions

• Q: Which Canon EF lenses are compatible with the EF 1.4x III teleconverter?

  A: The teleconverter is designed to work with a range of Canon EF lenses, particularly select telephoto and super-telephoto models. Always verify compatibility with your specific lens model and camera body to ensure optimal AF performance and metering accuracy.

• Q: How does using the teleconverter affect autofocus and light throughput?

  A: Using a 1.4x teleconverter generally preserves autofocus on many coatings and lenses, but AF speed can be modestly reduced compared with using the lens alone. Additionally, light transmission is reduced, typically by about one stop, which can influence exposure settings and low-light performance. Review your camera’s exposure indicators after mounting the teleconverter to adjust shutter speed or ISO as needed.

• Q: Will image quality degrade when using the teleconverter?

  A: Canon’s Extender EF 1.4x III is engineered to minimize chromatic aberration and maintain high optical quality. While there will be some impact on sharpness and contrast relative to the lens alone, the extender is designed to deliver sharp, detailed results that satisfy demanding telephoto work when used with compatible lenses.

• Q: How should I care for and store the teleconverter?

  A: Keep the teleconverter clean and dry, preferably stored in its protective case when not in use. Handle with care to avoid dust, debris, or moisture entering the mount. Use a soft microfiber cloth for cleaning the contact surfaces if necessary and ensure that both mounts are free of dust before mounting on the camera body and lens.

• Q: Can I stack multiple teleconverters?

  A: Stacking teleconverters is not recommended and can lead to severe degradation of image quality and autofocus performance. Use this extender as a single 1.4x multiplier between the camera and an approved lens for best results.