Canon 100-400 with 1.4 Extender: A Complete Review

Canon 100-400 with 1.4 Extender: A Complete Review


A complete review of the Canon 100-400 with 1.4 Extender, exploring its features, performance, and suitability for various types of photography. We will delve into the build and design, image quality, autofocus, and image stabilization, providing an in-depth look at this popular telephoto lens and extender combo. Whether you’re a wildlife, sports, or event photographer, this review will help you determine if this set up is the right choice for your needs.

What are the key features and design of the Canon 100-400 with 1.4 Extender?

The Canon 100-400mm f/4.5-5.6L IS II USM lens, when paired with the Canon EF 1.4x III Extender, creates a versatile telephoto zoom setup. The lens itself is constructed of high-quality materials, featuring weather-sealing for durability in various shooting conditions. It also boasts a rotating zoom ring that allows for smooth and precise focal length adjustments, along with a versatile focal length range that covers a wide variety of shooting situations.

The 1.4x Extender extends the reach of the lens, effectively turning it into a 140-560mm f/6.3-8 lens. The extender maintains the lens’s overall build quality and weather sealing, ensuring that it is a seamless addition to the 100-400mm lens. Both the lens and extender together offer exceptional optical performance, allowing photographers to capture stunning images even at extended focal lengths.

How does the Canon 100-400 with 1.4 Extender perform in terms of image quality?

When it comes to image quality, the Canon 100-400 with 1.4 Extender delivers impressive results. The lens provides sharpness and clarity throughout its focal length range, and the addition of the 1.4x Extender does not significantly compromise image quality. Even when shooting at the longest focal length with the extender attached, the lens maintains its ability to produce detailed and vibrant images.

Chromatic aberration and distortion are well-controlled, and the lens’s advanced optical coatings effectively reduce flare and ghosting. Whether capturing distant wildlife, fast-paced sports action, or any other subject, the Canon 100-400 with 1.4 Extender consistently delivers images with excellent sharpness and color rendering.

How does the autofocus system of the Canon 100-400 with 1.4 Extender perform?

The lens’s autofocus system is quick, accurate, and reliable, making it well-suited for capturing moving subjects. Whether photographing wildlife in action or tracking athletes on the field, the autofocus system keeps up with the fast-paced demands of various photography genres.

The addition of the 1.4x Extender does not significantly hinder the autofocus performance, as the lens remains responsive and effective in acquiring focus on subjects. With the lens and extender combination, photographers can confidently rely on the autofocus system to deliver sharp, well-focused images in a wide range of shooting situations.

How does the image stabilization of the Canon 100-400 with 1.4 Extender enhance its performance?

The lens features an effective 4-stop image stabilization system, providing photographers with the ability to shoot handheld at slower shutter speeds while maintaining sharpness. This is particularly beneficial when working in low-light conditions or when capturing distant subjects at longer focal lengths.

When the 1.4x Extender is attached, the image stabilization system continues to deliver reliable performance, allowing photographers to achieve stable, blur-free images even when shooting at extended focal lengths. This feature is invaluable in ensuring the lens’s versatility and usability across a wide range of photographic scenarios.


The Canon 100-400mm f/4.5-5.6L IS II USM lens, paired with the Canon EF 1.4x III Extender, offers an exceptional telephoto photography experience. Its robust build quality, impressive image quality, reliable autofocus, and effective image stabilization make it a versatile and reliable tool for wildlife, sports, and event photographers. Whether capturing distant subjects or fast-moving action, this lens and extender combination consistently delivers outstanding results.


1. Can the 1.4x Extender be used with other lenses?

The Canon EF 1.4x III Extender is compatible with a selection of Canon’s telephoto lenses, including the 100-400mm f/4.5-5.6L IS II USM. However, it’s essential to ensure compatibility with specific lenses before using the extender.

2. Is the 1.4x Extender weather-sealed like the 100-400mm lens?

Yes, the Canon EF 1.4x III Extender features weather-sealing, allowing it to withstand various environmental conditions when paired with compatible lenses.

3. Does the addition of the 1.4x Extender affect the lens’s maximum aperture?

With the 1.4x Extender attached, the maximum aperture of the lens is effectively reduced by one stop. For example, the 100-400mm f/4.5-5.6L IS II USM becomes a 140-560mm f/6.3-8 lens when used with the extender.

4. How does the 1.4x Extender impact image quality?

The Canon EF 1.4x III Extender maintains the exceptional image quality of compatible lenses, effectively extending their reach while preserving sharpness, clarity, and color rendering. When used with the 100-400mm lens, the extender delivers impressive optical performance.

5. Can the lens and extender combination be used for video recording?

Yes, the Canon 100-400mm with 1.4 Extender is well-suited for video recording, providing smooth and reliable autofocus and image stabilization for capturing high-quality footage. Its versatile focal length range and optical performance make it an excellent choice for videographers.


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