| A compact and lightweight 300mm super-telephoto
lens with Image Stabilizer (IS), similar to EF75-300mm f/4-5.6 IS USM. The
Image Stabilizer shifts a lens group (11th to 13th elements) in parallel to
the film plane. Camera shake is a major cause of blurred images especially
with telephoto lenses. The IS system helps resolving this problem. The image
stabilizing effect is equivalent to about two steps of shutter speed. "IS
Mode 2" is newly applied to stabilize finder images at panning shots of
moving subjects. The optical system uses two UD (Ultra-low Dispersion) glass
lens elements (2nd & 5th) to compensate secondary spectrum and provide sharp,
high-contrast images from maximum aperture.
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