Canon Ultrasonic EF400mm f 4L DO IS USM Instruction Manual

Canon Ultrasonic EF400mm f 4L DO IS USM manual cover
Pages 17
Year 2002
Language(s)
English en

Canon Ultrasonic EF400mm f 4L DO IS USM Specification

The Canon Ultrasonic EF400mm f/4L DO IS USM Lens is a high-performance telephoto lens designed for professional photographers who demand superior image quality and versatility. Featuring Canon's advanced Diffractive Optics (DO) technology, this lens combines compact size and lightweight construction with exceptional optical performance. The 400mm focal length offers excellent reach, making it ideal for sports, wildlife, and action photography.

The lens boasts a maximum aperture of f/4, providing a good balance between depth of field control and low-light capability. The Ultrasonic Motor (USM) ensures fast, silent, and precise autofocus, crucial for capturing dynamic subjects with accuracy. The lens is equipped with Image Stabilization (IS), which compensates for camera shake and allows photographers to shoot handheld at lower shutter speeds, enhancing versatility in various lighting conditions.

Constructed with Canon's renowned L-series quality, the lens is durable and weather-sealed, suitable for challenging environments. The multi-layer Diffractive Optical elements reduce chromatic aberrations and improve image sharpness, while Super Spectra coatings minimize flare and ghosting, enhancing contrast and color fidelity. The 9-blade circular diaphragm contributes to pleasing bokeh, isolating subjects against beautifully blurred backgrounds.

The Canon EF400mm f/4L DO IS USM Lens is compatible with Canon's range of full-frame and APS-C DSLR cameras, offering flexibility across different photography platforms. Its design emphasizes portability without compromising optical excellence, making it a preferred choice for professionals seeking a robust and reliable telephoto solution. Overall, this lens represents a blend of innovation and tradition, embodying Canon's commitment to advancing photographic technology while maintaining the highest standards of image quality.

Canon Ultrasonic EF400mm f 4L DO IS USM F.A.Q.

What are the key features of the Canon Ultrasonic EF400mm f/4L DO IS USM lens?

The Canon Ultrasonic EF400mm f/4L DO IS USM lens features a Diffractive Optics (DO) element, Image Stabilization (IS), and Ultra-low Dispersion (UD) glass to reduce chromatic aberration. It is part of Canon’s L-series, ensuring high durability and weather resistance.

How can I effectively use the Image Stabilization feature on this lens?

To effectively use Image Stabilization, switch the IS mode on the lens barrel. Mode 1 is for general photography, while Mode 2 is ideal for panning shots. Stabilization helps reduce camera shake, allowing for sharper images at slower shutter speeds.

What maintenance steps should I follow to keep the Canon EF400mm f/4L DO IS USM lens in excellent condition?

Regularly clean the lens using a microfiber cloth and lens cleaning solution. Store the lens in a dry, cool place and use a lens cap to protect the front element. Periodically check for dust or debris inside the lens and have it professionally serviced if needed.

What should I do if the autofocus is not working properly on my Canon EF400mm f/4L DO IS USM lens?

First, ensure that the lens is securely attached to the camera body. Check that the autofocus switch on the lens is set to AF. If issues persist, clean the electrical contacts on both the lens and camera with a dry cloth. If problems continue, consult Canon support.

How can I minimize chromatic aberration when using this lens?

To minimize chromatic aberration, use smaller apertures like f/5.6 or f/8. Additionally, avoid high-contrast scenes where aberration is more prominent. The lens's UD elements are designed to help reduce this issue effectively.

Is it possible to use extenders with the Canon EF400mm f/4L DO IS USM lens?

Yes, you can use Canon EF Extenders such as the EF 1.4x III or EF 2x III to increase the focal length. Note that using extenders may reduce the maximum aperture and affect autofocus performance.

What is the best way to achieve a smooth bokeh effect with this lens?

To achieve a smooth bokeh effect, use a wide aperture like f/4 to create a shallow depth of field. Position your subject far from the background and focus closely on the subject to accentuate the background blur.

How can I ensure accurate focus in low-light conditions with this lens?

In low-light conditions, use the lens's full-time manual focus capability to fine-tune focus, or increase ISO settings for better sensor sensitivity. Utilizing external lighting or focus assist beams from compatible accessories can also help achieve accurate focus.

What precautions should I take when using this lens in wet weather?

Although the lens is weather-sealed, it’s advisable to use a rain cover for additional protection. Ensure all seals are intact and avoid exposing the lens to excessive moisture. After use, wipe the lens dry to prevent water spots or damage.

How can I optimize sharpness when using the Canon EF400mm f/4L DO IS USM lens?

To optimize sharpness, use a sturdy tripod to minimize vibrations. Utilize the lens's IS feature for handheld shots, and select moderate apertures like f/8 for enhanced depth of field and sharpness. Keep the lens clean and regularly check for any optical issues.