Canon EOS 1Ds - Manual (Page 24)

V. ACCESSORIES 24
• Uses 2 UD lens elements to minimize lateral chromatic aberration to which wide-angle
lenses are prone, achieving superb image quality with excellent resolution and contrast
with little or no color bleed around the outline of the subject
• Lens coatings and lens disposition optimized to minimize the ghosting and flare that
frequently occur when the lens is used with a digital camera
• Waterproof and dustproof construction used in the mount, focus mode switch and
focusing ring to prevent dust and moisture from getting into the lens, making it suitable
for taking pictures even in harsh conditions
• EMD has circular aperture that produces beautiful out-of-focus images (bokeh)
• Rear focusing system, ring USM, high-speed CPU and improved AF algorithms for fast
and quiet autofocusing
• Manual focusing enabled even during the AF mode (full-time mechanical manual focus)
• Focus mode switch has been given a shape that prevents it from being changed
accidentally
• Equipped with constriction-type gelatin filter holder at the rear of the lens
• Uses a new type of specially designed lens cap (Lens Cap 14) that is both light and secure
• Optical system constructed using only glass which is lead-free
Lens without optimized coating Lens with optimized coating
Flare and Ghosting Suppressed