The Canon EF 800mm f/5.6L IS USM
Autofocus Lens is currently Canon's longest
telephoto lens, and an excellent choice for any
long-distance application, e.g. outdoor sports,
wildlife, news photojournalism, and so on. Even
though its long 800mm focal length, the
magnesium alloy used in the construction for
this lens makes it lighter then the 600mm f/4L
lens, weighing in at less than 10 lbs (4.5kg).
This lens shares
the same lightweight, weather-resistant
construction as the rest of the IS Super
Telephoto lenses, as well as their improved
control layout, improved weight distribution,
and mechanical manual focus. Its IS Image
Stabilizer mechanism allows the use of shutter
speeds up to 4 times slower with no perceptible
increase in image blur.
For optimum
visual performance, the lens incorporates four
types of special optical elements: aspherical
elements to correct spherical aberrations, and
refracting Fluorite, UD and Super UD (ultra-low
dispersion) elements to eliminate secondary
chromatic aberrations.
