• Compact L-series Telephoto lens with Image Stabilizer
• UD elements eliminate secondary spectrum chromatic aberration
• Two-stage image stabilization; dual-axis camera shake correction or vertical axis only (for panning)
• Full-time manual focus override on lens

Compact L-series telephoto lens with an Image Stabilizer which compensates for camera shake with the equivalent effect of a shutter speed two stops faster. Two Image Stabilizer modes are provided: Stabilizer Mode 1 (the same mode featured on the EF 75-300mm f/4-5.6 IS USM) and the new Stabilizer Mode 2 which steadies the image during horizontal or vertical panning. Mode 2 detects the panning direction automatically. The closest focusing distance is 4.9 feet (1.5 m).

The Canon EF 300mm f/4L IS USM Autofocus Lens is controlled by a 16-bit microcomputer that minimizes blurred images due to camera shake. A special mode intelligently compensates just for up & down movement, providing sharp, stable images for panning. The optical design that compensates for all types of aberrations from infinity to the closest shooting distance of 4.9′. Two ultra-low dispersion (UD) glass elements ensure clear images and accurate color. Image Stabilization technology gives you the equivalent effect of up to 2 full shutter speeds slower handholdability than a conventional lens. And Canon’s advanced ultrasonic focusing motor (USM) and rear focusing design provide silent, high speed autofocusing with fulltime manual focus override.

Reviews

Canon EF 300mm f/4.0 L IS USM Lens Review by the-digital-picture.com

This lens a a very good value. The Canon EF 300mm f/4.0 L IS USM Lens delivers great image quality and physical features for a relatively low price. If you need only 300mm (and 420mm available with the 1.4x) and f/4 is a wide enough aperture for you, look no farther.

Canon EF 300mm f/4 L IS USM Interchangeable Lens Review by ephotozine.com

In summary, the positive points of the Canon 300mm f/4 L IS USM are:

• Excellent build quality
• Good contrast and colour rendition
• Retractable lens hood a nice touch.

The negative points are:

• AF a little slow for class of lens
• Resolution may not be up to future sensors (although pixel race has now slowed)