Canon Ultrasonic EF100-400mm f 4.5-5.6L IS USM Instruction Manual

Canon Ultrasonic EF100-400mm f 4.5-5.6L IS USM manual cover
Pages 17
Year 2006
Language(s)
English en

Canon Ultrasonic EF100-400mm f 4.5-5.6L IS USM Specification

The Canon Ultrasonic EF100-400mm f/4.5-5.6L IS USM Lens is a high-performance telephoto zoom lens from Canon's esteemed L-series, designed for professional photographers seeking versatility and precision. This lens features a focal length range of 100-400mm, providing substantial reach suitable for wildlife, sports, and action photography. Its variable aperture of f/4.5-5.6 allows for flexibility in various lighting conditions while maintaining a manageable size and weight.

The lens incorporates Canon's Image Stabilization (IS) technology, reducing camera shake effects with up to two stops of stabilization, which is particularly beneficial for handheld shooting at longer focal lengths. The ultrasonic motor (USM) ensures fast and nearly silent autofocus performance, crucial for capturing dynamic and fleeting subjects without disturbing the scene. With a minimum focusing distance of 1.8 meters, the lens allows for detailed close-up shots without compromising image quality.

Optically, the lens is constructed with 17 elements in 14 groups, including one fluorite and one Super UD element, which effectively minimizes chromatic aberrations and enhances color fidelity. The lens also features a nine-blade circular aperture, contributing to a pleasing bokeh effect, ideal for isolating subjects against soft backgrounds. The robust build quality, characteristic of Canon's L-series, includes weather sealing to protect against dust and moisture, making it reliable for use in challenging environments.

The EF100-400mm f/4.5-5.6L IS USM lens offers compatibility with Canon's full-frame and APS-C DSLRs, expanding its versatility across different camera models. Its advanced optical design, combined with professional-grade features, makes this lens a valuable tool for photographers requiring extended reach without compromising on image quality or performance.

Canon Ultrasonic EF100-400mm f 4.5-5.6L IS USM F.A.Q.

What is the best way to clean the Canon Ultrasonic EF100-400mm f/4.5-5.6L IS USM lens?

To clean the lens, use a soft, lint-free cloth, preferably a microfiber cleaning cloth. For more stubborn smudges, lightly moisten the cloth with a lens cleaning solution. Avoid spraying liquids directly on the lens.

How can I prevent lens flare when using this lens?

Using a lens hood can help prevent lens flare by blocking stray light. Additionally, try to avoid pointing the lens directly at bright light sources.

What should I do if the autofocus is not working properly?

First, ensure that the lens is securely attached to the camera body. Check that the autofocus mode is selected on both the lens and camera. If issues persist, clean the electrical contacts with a dry, soft cloth.

How do I switch between auto and manual focus on this lens?

To switch between auto and manual focus, locate the focus mode switch on the side of the lens barrel and toggle it to AF (Autofocus) or MF (Manual Focus) as needed.

What is Image Stabilization (IS) and how does it work on this lens?

Image Stabilization (IS) helps reduce blur caused by camera shake. On this lens, it compensates for movement by adjusting the lens elements, allowing for sharper images in low-light conditions or when using slower shutter speeds.

How do I maintain the zoom mechanism of the lens?

Keep the zoom mechanism clean and free from dust. Regularly use a blower to remove particles. Avoid exposing the lens to sand or water, and operate the zoom ring gently without forcing it.

What should I do if the lens gets wet?

Quickly dry the exterior with a soft, absorbent cloth. Avoid using heat to dry the lens. If water has entered the lens, professional servicing may be necessary to prevent internal damage or mold.

Can this lens be used with extenders?

Yes, the Canon EF100-400mm f/4.5-5.6L IS USM lens is compatible with Canon EF 1.4x and EF 2x extenders, although autofocus performance might be affected.

How can I ensure sharp images when using this telephoto lens?

For sharp images, use a tripod or monopod to stabilize the camera, especially at longer focal lengths. Use a fast shutter speed and engage the lens's Image Stabilization feature.

Why is my lens making a noise during focusing?

Some noise during focusing is normal due to the USM motor. However, if the noise is unusual or louder than before, check for debris around the focus ring and ensure the lens is not damaged.