Canon Ultrasonic EF400mm f 4 DO IS II USM Instruction Manual

Canon Ultrasonic EF400mm f 4 DO IS II USM manual cover
Pages 24
Year 2014
Language(s)
English en

Canon Ultrasonic EF400mm f 4 DO IS II USM Specification

The Canon Ultrasonic EF400mm f/4 DO IS II USM Lens is a high-performance telephoto lens designed for professional photographers seeking superior image quality and versatility. It features an advanced Diffractive Optics (DO) design, which allows for a more compact and lightweight build without compromising optical performance. The lens has a maximum aperture of f/4, providing excellent low-light capabilities and depth-of-field control. The integrated Image Stabilization (IS) system offers up to four stops of correction, making it ideal for handheld shooting and reducing camera shake effects. It is equipped with a ring-type Ultrasonic Motor (USM) that ensures fast, precise, and silent autofocus, with full-time manual focus override for additional control. The lens elements are treated with Canon's Super Spectra Coating to minimize ghosting and flare, enhancing contrast and color fidelity. Additionally, the lens features a fluorine coating on the front and rear elements to repel water and oil, making it easier to clean. Its robust construction includes a durable magnesium alloy body, and it is sealed against dust and moisture, making it suitable for various environmental conditions. The Canon EF400mm f/4 DO IS II USM is compatible with Canon EF mount cameras and is an excellent choice for wildlife, sports, and action photography due to its reach and performance.

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

How do I properly clean the Canon Ultrasonic EF400mm f/4 DO IS II USM Lens?

To clean your lens, use a soft, lint-free cloth to gently wipe the lens surface. For stubborn spots, slightly dampen the cloth with a lens cleaning solution. Avoid using canned air and always ensure the lens is stored with the cap on when not in use.

What is the best way to stabilize the lens for handheld shooting?

To stabilize the lens, use the built-in Image Stabilization (IS) feature. Ensure that the IS switch is turned on. Additionally, practice proper hand-holding techniques by supporting the lens with your left hand and keeping your elbows close to your body.

How can I update the firmware of the Canon EF400mm f/4 DO IS II USM Lens?

Canon lenses do not typically require firmware updates. If a firmware update is necessary, it will be provided by Canon for the camera body and not the lens itself. Regularly check Canon's official website for updates related to your camera.

What should I do if the autofocus seems slow or unresponsive?

First, ensure that the lens contacts are clean by gently wiping them with a microfiber cloth. Check that the AF/MF switch is set to AF. If the issue persists, try resetting your camera settings or testing the lens on another camera body.

How do I prevent lens flare when using the Canon EF400mm f/4 DO IS II USM Lens?

To prevent lens flare, use the included lens hood to shield the lens from direct sunlight. Additionally, avoid shooting directly into bright light sources, and consider changing your shooting angle to minimize flare.

How can I check if the Image Stabilization is working properly?

To check if the IS is working, listen for a slight hum or feel a gentle movement when IS is active. You can also take a series of test shots at slower shutter speeds; if IS is functioning, images should appear sharper than without IS.

What is the best way to store the Canon EF400mm f/4 DO IS II USM Lens?

Store the lens in a padded camera bag or case, away from extreme temperatures and humidity. Always use the lens cap and hood to protect the glass, and consider using silica gel packs to control moisture.

Why is my Canon EF400mm f/4 DO IS II USM Lens making a clicking noise?

The clicking noise is often due to the Image Stabilization system activating and deactivating. This is normal and should not affect lens performance. If the noise persists or seems abnormal, consult Canon support.

Can I use teleconverters with the Canon EF400mm f/4 DO IS II USM Lens?

Yes, you can use Canon EF Extenders, such as the EF 1.4x III or EF 2x III, with this lens to increase focal length. Be aware that using extenders may reduce autofocus speed and maximum aperture.

What maintenance should be performed regularly on the Canon EF400mm f/4 DO IS II USM Lens?

Regularly inspect the lens for dust and debris. Clean the lens elements and contacts as needed. Check the operation of zoom and focus rings, as well as switches, to ensure they are functioning smoothly. Ensure firmware and lens calibration are up to date if needed.