Canon Ultrasonic EF300mm f 2.8L IS USM Instruction Manual

Canon Ultrasonic EF300mm f 2.8L IS USM manual cover

Pages 22

Year 1999

Language(s)

of 22

Canon Ultrasonic EF300mm f 2.8L IS USM Specification

The Canon Ultrasonic EF300mm f/2.8L IS USM lens is a high-performance telephoto lens designed for professional photographers who demand superior image quality and reliability. Featuring a robust construction, the lens is part of Canon's prestigious L-series, known for its exceptional optical performance and durability. It boasts a maximum aperture of f/2.8, allowing for excellent low-light performance and the ability to create a shallow depth of field, which is ideal for isolating subjects from backgrounds. The lens incorporates Canon's Image Stabilization technology, providing up to 4 stops of shake correction, which is particularly beneficial when shooting handheld in challenging lighting conditions.

The Ultrasonic Motor (USM) ensures fast and virtually silent autofocus, making it suitable for both still photography and video applications. Its optical design includes high-quality elements such as Fluorite and UD glass, which minimize chromatic aberrations and deliver sharp, high-contrast images. With a focal length of 300mm, the lens is optimal for sports, wildlife, and action photography, offering excellent reach and the ability to capture distant subjects with clarity. Designed with professionals in mind, the lens is weather-sealed, providing protection against dust and moisture, thus ensuring reliable performance in a variety of environmental conditions.

The Canon EF300mm f/2.8L IS USM lens is compatible with Canon's full-frame and APS-C DSLR cameras, offering versatility across different shooting scenarios. Its integration with Canon's Extender EF 1.4x and Extender EF 2x further enhances its versatility by extending the focal length while maintaining high image quality. Overall, this lens embodies a combination of advanced optical technology, robust build quality, and practical features, making it a preferred choice for professionals who require uncompromising performance.

Canon Ultrasonic EF300mm f 2.8L IS USM F.A.Q.

How do I properly mount the Canon Ultrasonic EF300mm f/2.8L IS USM Lens on my camera?

To mount the lens, align the red dot on the lens with the red dot on the camera body. Gently rotate the lens clockwise until it clicks into place, indicating that it is securely attached.

What are the best settings to use for sports photography with this lens?

For sports photography, use a fast shutter speed (e.g., 1/1000s or faster) to freeze motion. Set the aperture to f/2.8 for a shallow depth of field and enable image stabilization to reduce shake. Consider using AI Servo focus mode for continuous tracking of moving subjects.

How can I clean the lens to ensure optimal performance?

Use a blower to remove loose dust, then gently wipe the lens with a microfiber cloth. For smudges, apply a small amount of lens cleaning solution to the cloth and clean in circular motions. Avoid applying the solution directly to the lens.

Why is my Canon EF300mm f/2.8L IS USM lens not focusing properly?

Ensure that the lens is set to AF mode. Check if there is any obstruction on the lens elements. If the problem persists, try cleaning the contacts on the lens and camera body. If autofocus still fails, consider resetting the camera settings or testing with another camera body.

What is the best way to store the lens when not in use?

Store the lens in a cool, dry place in its protective case to prevent dust and moisture buildup. Ensure that the lens cap is on and consider using silica gel packets to control humidity.

How do I switch between different IS modes on this lens?

The Canon EF300mm f/2.8L IS USM lens has a switch on the side for IS modes. Mode 1 is for general use, mode 2 is for panning, and mode 3 activates stabilization only during exposure. Choose the appropriate mode based on your shooting situation.

Can I use extenders with the Canon EF300mm f/2.8L IS USM lens?

Yes, the lens is compatible with Canon Extender EF 1.4x III and Extender EF 2x III. These extenders increase the focal length to 420mm and 600mm, respectively, but may reduce the maximum aperture and affect autofocus speed.

What maintenance should be conducted to ensure long-term functionality of the lens?

Regularly clean the lens elements and contacts, and check for dust or fungus inside the lens. Store in a controlled environment and periodically inspect for any mechanical issues. Professional servicing is recommended every couple of years for optimal performance.

How do I manually focus the Canon EF300mm f/2.8L IS USM lens?

Switch the focus mode to MF on the lens barrel. Rotate the focus ring to adjust focus manually. Use the distance scale on the lens for guidance and achieve precise focus by using the camera's viewfinder or live view.

What should I do if the lens image stabilization is not working?

Check if the IS switch is set to the correct mode. If the issue persists, clean the lens contacts and ensure that the battery is fully charged. If these steps do not resolve the problem, the lens may require professional repair.