Canon EF 400mm f/4 DO IS II USM EF400mm f/4 DO IS II USM Instructions - Page 2

Thank you for purchasing a Canon product. Canon's EF400mm f/4 DO IS II USM is a highperformance super telephoto lens, for use with EOS cameras, which includes a newly-developed DO lens (Gapless Dual-Layer Diffractive Optical Element) and is designed to be compact and lightweight. OO "DO" stands for Diffractive Optics. OO "IS" stands for Image Stabilizer. OO "USM" stands for Ultrasonic Motor. Features 1. An optimal combination of DO elements providing good compensation of chromatic aberration and an aspherical element providing good compensation of aberrations, giving superior definition as well as achieving compactness. 2. The Image Stabilizer gives the equivalent effect of a shutter speed 4 stops* faster (when using an EOS-1D X). Also, a third Image Stabilizer mode effective for shooting irregularly moving subjects. 3. SWC (Subwavelength Structure Coating) reduces flare and ghosting. 4. Using a fluorine coating on the foremost and rearmost lens surfaces allows adhered dirt to be removed more easily than before. 5. Ultrasonic motor (USM) for fast, quiet autofocus. 6. Manual focusing is available after the subject comes into focus in autofocus mode (ONE SHOT AF). 7. An AF stop button to pause autofocus whenever desired. 8. A power focus mode enables smooth focus change. 9. A focus preset function for advance storage of focusing positions in memory to allow instantaneous focusing. 10. Can be used with EF1.4× III/EF2× III extenders. 11. Attachment slot provided for wire-type security lock, located under the cover for the orientation locking knob. 12. Tight seal structure provides excellent dustproof and drip-proof performance. However, it is unable to provide complete protection from dust and moisture. 13. Designed for lighter weight with parts made of magnesium alloy. * Based on CIPA (Camera & Imaging Products Association) standards. ENG-1