Canon Ultrasonic EF400mm f 2.8L IS III USM Instruction Manual

Canon Ultrasonic EF400mm f 2.8L IS III USM manual cover

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Year 2018

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Canon Ultrasonic EF400mm f 2.8L IS III USM Specification

The Canon Ultrasonic EF400mm f/2.8L IS III USM Lens is a high-performance super-telephoto lens designed for professional photographers seeking exceptional image quality and reliability. Featuring a maximum aperture of f/2.8, this lens excels in low-light conditions and provides stunning bokeh, making it ideal for sports, wildlife, and action photography. The lens incorporates Canon's advanced Image Stabilization (IS) technology, offering up to 5 stops of shake correction, ensuring sharp images even in challenging shooting environments. The fast and precise Ultrasonic Motor (USM) enables quick and silent autofocus, while the full-time manual focus option allows for fine-tuning focus adjustments without switching modes.

Constructed with a robust magnesium alloy body, the EF400mm f/2.8L IS III is both lightweight and durable, designed to withstand the rigors of professional use. The lens features fluorite and Super UD glass elements that significantly reduce chromatic aberrations and enhance image clarity and contrast. Canon's renowned Air Sphere Coating (ASC) minimizes lens flare and ghosting, ensuring high-quality results even in backlit conditions. The lens is also equipped with customizable focus presets, allowing photographers to instantly recall predefined focus distances, adding versatility and speed to their workflow. Weather-sealing and fluorine coatings on the front and rear elements provide additional protection against dust and moisture, making it suitable for outdoor and challenging conditions. Overall, the Canon EF400mm f/2.8L IS III USM Lens represents a blend of cutting-edge optical technology and professional-grade build quality, catering to the demands of serious photographers who require top-tier performance and reliability.

Canon Ultrasonic EF400mm f 2.8L IS III USM F.A.Q.

What are the key features of the Canon Ultrasonic EF400mm f/2.8L IS III USM Lens?

The Canon EF400mm f/2.8L IS III USM Lens features a fast f/2.8 maximum aperture, Image Stabilization up to 5 stops, fluorite and Super UD elements for image quality, and a durable, lightweight design for enhanced portability.

How do I clean the lens elements of the Canon EF400mm f/2.8L IS III USM?

To clean the lens elements, use a blower to remove dust, a lens cleaning brush for particles, and a microfiber cloth with lens cleaning solution for smudges. Avoid excessive moisture to protect the lens coatings.

What is the best way to store the Canon EF400mm f/2.8L IS III USM Lens when not in use?

Store the lens in a cool, dry place inside a protective case or a padded camera bag. Ensure lens caps are attached to prevent dust and moisture accumulation. Consider using silica gel packs to control humidity.

How can I troubleshoot autofocus issues with my Canon EF400mm f/2.8L IS III USM Lens?

Check if the lens is securely attached to the camera body, ensure the AF/MF switch is set to AF, clean the electrical contacts, and verify camera settings. If issues persist, test with another camera body or contact Canon support.

What are the best settings for wildlife photography using the Canon EF400mm f/2.8L IS III USM Lens?

Use a fast shutter speed (1/1000s or faster) to freeze motion, set the aperture to f/4 or f/5.6 for sharpness and depth of field, and adjust the ISO based on lighting conditions. Utilize the lens's Image Stabilization for handheld shots.

How do I update the firmware of the Canon EF400mm f/2.8L IS III USM Lens?

Canon lenses typically do not require firmware updates. However, ensure your camera body is updated, as it may affect lens performance. Refer to Canon's official website or support for any lens-specific updates.

Can the Canon EF400mm f/2.8L IS III USM Lens be used with extenders?

Yes, the lens is compatible with Canon Extenders, such as the EF 1.4x III and EF 2x III, to increase focal length while maintaining autofocus capabilities. Note that the maximum aperture will decrease when using extenders.

What maintenance steps are recommended to ensure the longevity of my Canon EF400mm f/2.8L IS III USM Lens?

Regularly clean the lens elements and contacts, store the lens properly, avoid exposing it to extreme temperatures or moisture, and have it serviced by Canon professionals periodically to maintain optimal performance.

How effective is the Image Stabilization on the Canon EF400mm f/2.8L IS III USM Lens?

The Image Stabilization on this lens is highly effective, offering up to 5 stops of correction, making it ideal for low-light conditions and handheld photography, reducing the risk of motion blur.

What should I do if my Canon EF400mm f/2.8L IS III USM Lens gets wet?

Immediately dry the lens with a soft, absorbent cloth. Do not disassemble the lens. Allow it to dry completely before use. If water penetrates the lens, seek professional servicing from Canon to prevent damage.