Canon Ultrasonic EF17-40mm f 4L USM Instruction Manual

Canon Ultrasonic EF17-40mm f 4L USM manual cover

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Year 2003

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Canon Ultrasonic EF17-40mm f 4L USM Specification

The Canon Ultrasonic EF17-40mm f/4L USM Lens is a versatile wide-angle zoom lens designed for both full-frame and APS-C format Canon EOS cameras, making it ideal for landscape, architecture, and event photography. With a focal length range of 17-40mm, it offers a broad perspective suitable for capturing expansive scenes. The lens features a constant maximum aperture of f/4, providing consistent exposure settings throughout the zoom range. Its optical construction comprises 12 elements in 9 groups, including Super Spectra coatings and three aspherical elements to minimize chromatic aberrations and distortions, ensuring high image clarity and color fidelity. The inclusion of a Super Ultra-Low Dispersion (Super UD) glass element further enhances optical performance by reducing secondary spectrum.

The EF17-40mm f/4L USM is known for its robust build, featuring a weather-sealed body that protects against dust and moisture, making it suitable for challenging outdoor conditions. An ultrasonic motor (USM) facilitates fast, quiet, and precise autofocus, while full-time manual focus override allows photographers to fine-tune focus without switching modes. This lens has a minimum focusing distance of 0.28 meters, enabling close-up shots with a maximum magnification of 0.24x. The 77mm filter thread supports various filters, including polarizers and graduated neutral density filters. Its compact design, weighing approximately 500 grams, ensures easy portability without compromising performance. The Canon EF17-40mm f/4L USM Lens combines professional-grade optics with durable construction, making it a reliable choice for photographers seeking high-quality wide-angle capabilities.

Canon Ultrasonic EF17-40mm f 4L USM F.A.Q.

How do I clean the Canon EF 17-40mm f/4L USM lens to ensure optimal performance?

To clean the Canon EF 17-40mm f/4L USM lens, use a soft, lint-free cloth slightly dampened with lens cleaning solution. Gently wipe the lens surface, and use a blower brush to remove dust. Avoid using harsh chemicals or rough materials that could scratch the lens.

What is the best way to store the Canon EF 17-40mm f/4L USM lens when not in use?

Store the lens in a cool, dry place inside a padded camera bag or protective case. Ensure that both lens caps are securely attached to prevent dust and moisture from entering. Using silica gel packs can help control humidity inside the storage space.

How can I prevent lens flare when using the Canon EF 17-40mm f/4L USM lens?

To prevent lens flare, attach the lens hood that comes with the Canon EF 17-40mm f/4L USM lens. Additionally, try to avoid shooting directly into bright light sources such as the sun. Adjusting your shooting angle can also help minimize flare.

What should I do if the autofocus on my Canon EF 17-40mm f/4L USM lens is not working properly?

If the autofocus is not working, first ensure that the lens is correctly mounted on the camera body. Check that the AF/MF switch is set to AF. Clean the contacts between the lens and camera with a soft, dry cloth. If the issue persists, consult Canon support or a professional technician.

Can I use filters with the Canon EF 17-40mm f/4L USM lens, and if so, what size should they be?

Yes, you can use filters with the Canon EF 17-40mm f/4L USM lens. The filter thread size for this lens is 77mm. Ensure that the filters you purchase are compatible with this size to avoid vignetting and other issues.

What is the minimum focusing distance of the Canon EF 17-40mm f/4L USM lens?

The minimum focusing distance of the Canon EF 17-40mm f/4L USM lens is approximately 0.28 meters (11 inches). This allows you to get relatively close to your subject for wide-angle shots with good detail.

Is the Canon EF 17-40mm f/4L USM lens weather-sealed, and what precautions should I take in adverse weather conditions?

The Canon EF 17-40mm f/4L USM lens is weather-resistant, with seals to protect against dust and moisture. However, it is not completely waterproof, so avoid exposing it to heavy rain or submerging it in water. Use a protective cover when shooting in adverse weather.

How can I achieve sharp images with the Canon EF 17-40mm f/4L USM lens?

To achieve sharp images, use a tripod to stabilize your camera, especially in low-light conditions. Select an appropriate aperture, typically between f/8 and f/11, for maximum sharpness. Ensure accurate focus and use a remote shutter release or timer to minimize camera shake.

What are some common uses for the Canon EF 17-40mm f/4L USM lens?

The Canon EF 17-40mm f/4L USM lens is versatile and commonly used for landscape, architecture, and interior photography. Its wide-angle capabilities make it ideal for capturing expansive scenes and tight spaces.

How can I update the firmware on my Canon EF 17-40mm f/4L USM lens?

The Canon EF 17-40mm f/4L USM lens itself does not require firmware updates, as firmware updates are typically for camera bodies. Ensure your camera's firmware is up to date to maintain compatibility and performance with the lens.