Canon EOS-1D Mark II Digial Opuscolo e specifiche - Pagina 8

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EOS: The Most Comprehensive

Digital SLR System

Canon's world-renowned line-up of EF Lenses includes over 50 models ranging from 14mm ultra-wide-angle to 600mm

super-telephoto. Through Canon's advanced optical know-how and sub-micron precision engineering, EF Lenses offer

unprecedented capabilities that meet wide-ranging needs. Leading features include a high precision Ultrasonic Motor

that silently drives the AF mechanism, an Image Stabilizer that automatically compensates for camera shake, aspherical

optics, Fluorite lenses, Ultra Low Dispersion (UD) lenses, and Super UD lenses.

No other line of lenses carries the reputation of Canon's renowned L-series. Easily recognised by the bold red ring around

the outer barrel, these lenses utilise the best in Canon's cutting-edge technology, and feature superior durability and resistance

to the elements, enhancing performance without compromising ease-of-use.

One of the greatest challenges in the design of a telephoto lens has been the minimisation of colour

fringing, or chromatic aberration. So, some L-series lenses use Canon's Ultra Low Dispersion glass to

help minimise this effect. The design of the UD glass provides outstanding contrast and sharpness

and minimises the splitting of colours as they pass through the elements. In certain super-telephoto

lenses, Fluorite elements are used, as they are even more effective in minimising these characteristics,

enabling more compact lens design with no compromise in performance. Wide angle and fast standard

lenses often suffer from another optical problem: Spherical Aberration. This occurs when the point of

focus of the light ray coming through the centre of the lens does not align with the point of focus of the light ray coming through

the lens edge. Since there is no sharp point of focus, the image looks blurred. Canon's aspherical elements change the curvature

from centre to edge to align the points of focus of the incoming light rays so that the entire image plane appears focused.