Outstanding optical performance that visually matches the images quality of the host lens. Maintains AF operation within aperture limits of camera body.

(Combines f/8 for EOS-1V and EOS-3 - f/5.6 for other EOS models.) Maintains IS operation. High level water and dust resistance equivelant to the EOS-1V and Super Tele L Series IS lens range - suitable for use in heavy rain. O-ring seals protect the mounts and release lever.

Designed to match Canon's telephoto L Series lens range with improved optical performance that visually matches the image quality of the host lens and high-level weather resistance.