Canon Ultrasonic EF70-200mm f 4L USM Instruction Manual

Canon Ultrasonic EF70-200mm f 4L USM manual cover
Pages 13
Year 2002
Language(s)
English en

Canon Ultrasonic EF70-200mm f 4L USM Specification

The Canon Ultrasonic EF70-200mm f/4L USM Lens is a versatile telephoto zoom lens designed for Canon's EOS series of digital single-lens reflex cameras. It features a focal length range of 70-200mm, making it ideal for various photography applications, including sports, wildlife, and portrait photography. The lens is part of Canon's L-series, denoting its superior optical performance, robust construction, and professional-grade quality.

With a constant maximum aperture of f/4, the lens provides consistent exposure and depth-of-field control across the entire zoom range. The optical design incorporates 16 elements in 13 groups, with one fluorite and two ultra-low dispersion (UD) elements to minimize chromatic aberrations and ensure high-resolution images with enhanced sharpness and contrast. The lens uses Canon's Ultrasonic Motor (USM) for fast, precise, and quiet autofocus operation, while the full-time manual focus allows photographers to make fine adjustments without switching modes.

The lens's internal focusing mechanism maintains the same length during focusing, enhancing handling and balance. The Canon EF70-200mm f/4L USM also features a circular aperture diaphragm with eight blades, producing pleasing bokeh and smooth out-of-focus areas. Its minimum focusing distance is 1.2 meters, offering a maximum magnification of 0.21x, suitable for capturing detailed close-up shots from a distance.

Constructed with high-grade materials, the lens is designed to withstand the rigors of professional use, featuring dust and moisture resistance for reliable performance in challenging environments. Weighing approximately 705 grams and measuring 76mm in diameter and 172mm in length, it is relatively lightweight and compact for its class, providing portability without compromising on quality.

Canon Ultrasonic EF70-200mm f 4L USM F.A.Q.

How do I properly clean the Canon Ultrasonic EF70-200mm f/4L USM lens?

To clean the lens, use a soft, lint-free cloth or a blower brush to remove dust and debris. For smudges, use a lens cleaning solution on a microfiber cloth, gently wiping in a circular motion. Avoid excessive moisture and never apply liquid directly to the lens.

What should I do if my lens is not focusing correctly?

Ensure the lens is securely attached to the camera body. Switch between AF and MF modes to check if the issue persists. Clean the lens and camera contacts using a dry cloth. If problems continue, perform a manual focus test to identify any mechanical issues.

How can I prevent lens flare with the Canon EF70-200mm f/4L USM?

Use the provided lens hood to reduce lens flare. Position yourself to avoid direct sunlight hitting the lens. Additionally, consider using a polarizing filter to minimize reflections.

Is the Canon EF70-200mm f/4L USM lens weather-sealed?

The Canon EF70-200mm f/4L USM lens is not fully weather-sealed. It is advisable to use a protective cover when shooting in adverse weather conditions to prevent moisture and dust ingress.

How do I update the firmware for the Canon EF70-200mm f/4L USM lens?

The Canon EF70-200mm f/4L USM lens does not have updatable firmware. Ensure your camera body has the latest firmware for optimal compatibility and performance.

What is the minimum focusing distance of the Canon EF70-200mm f/4L USM lens?

The minimum focusing distance for the Canon EF70-200mm f/4L USM lens is approximately 1.2 meters (3.9 feet). This allows for relatively close-up shots while maintaining sharp focus.

Can I use a teleconverter with the Canon EF70-200mm f/4L USM lens?

Yes, the Canon EF70-200mm f/4L USM lens is compatible with Canon EF 1.4x and 2x teleconverters, which will extend the focal length. Note that using a teleconverter may reduce the maximum aperture and affect autofocus performance.

What is the best way to store the Canon EF70-200mm f/4L USM lens when not in use?

Store the lens in a cool, dry place, preferably in a padded case. Keep it with the lens cap on to protect the glass. Avoid exposure to direct sunlight and humid environments to prevent mold growth.

How can I achieve better image stabilization with this lens?

The Canon EF70-200mm f/4L USM does not have built-in image stabilization. To achieve better stability, use a tripod or monopod. Alternatively, increase the shutter speed to reduce the effects of camera shake.

What should I do if the zoom ring on my Canon EF70-200mm f/4L USM lens is stiff?

If the zoom ring feels stiff, check for dust or debris. Gently clean the area around the zoom ring. If the problem persists, it may require professional servicing to ensure smooth operation without damaging the internal components.