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Overview: The Canon EF300mm f/4L IS USM lens is a
high-performance telephoto lens for use with Canon EOS cameras. The lens features
a built-in Ultrasonic Motor (USM) for quick and quiet autofocusing, and an Image
Stabilizer. The lens is constructed of
15 elements in 11 groups, including UD (ultra-low dispersion)
elements for excellent imaging capability.
Image Stabilizer (IS): The built-in Image Stabilizer can be
used in the AF (autofocus) or MF (manual focus) modes. The Image Stabilizer
starts operating when you press the shutter button halfway, and gives the
equivalent effect of a shutter speed two stops faster. Two switches located on
the barrel of the lens allow you to turn the image stabilizer on and off, and
switch between the two stabilizer modes:
- Mode 1: used for normal photography; corrects
vibrations in all directions
- Mode 2: corrects vertical camera shake during following
shots in a horizontal direction; also corrects horizontal camera shake
during following shots in a vertical direction.
Focus Modes: The EF300mm lens is equipped with a two-way
switch for setting the Focus Mode. You can choose from AF (auto focus) or MF
(manual focus). In Manual Focus mode, you can focus on your subject by turning
the focus ring. The focusing ring always works, regardless of the focus mode.
Focus Range Switch: You can switch between two focusing
ranges using the two-way switch on the barrel of the lens. You can choose from a
range of 1.5 meters (4.9') to
infinity, or a range of 3 meters (9.8') to infinity. Depending on your subject matter, the correct choice of focus range can reduce the
auto focusing time.
Lens Hood: The built-in, non-detachable lens hood cuts out unwanted light
and protects the lens from rain, snow, and dust. Extending the lens hood adds
approximately 2-3/8 inches to the overall length of the lens.
Tripod Mount: The included tripod mount ring allows you to
mount the camera onto a tripod by the lens instead of the camera body. You can
loosen the orientation lock knob on the tripod mount and rotate it as needed for
switching between vertical and horizontal positions.
Display Window: The EF300mm lens has a display window on the
barrel near the focus range switch that provides the following:
- Infinity Compensation Mark: The lens provides an "L"
infinity mark to compensate for shifting of the infinity focus point that
results from changes in temperature. The infinity position at normal
temperature is the point at which the vertical line of the L mark is aligned
with the distance indicator on the distance scale.
- Infrared Index: The infrared index corrects the focus
setting when using monochrome infrared film.
Optional Lens Extenders: The lens is compatible with EF1.4x
II and EF2x II lens extenders (sold separately). The extenders will
increase the focal length to 420mm (EF1.4x) and 600mm (EF2x).
- Focal Length: 300mm
- Minimum Aperture: f/32
- Maximum Aperture: f/4
- Minimum Focus Distance: 4.9 feet
- Filter Diameter: 77mm
- Angle of View:
- Diagonal: 8° 15'
- Vertical: 4° 35'
- Horizontal: 6° 50'
- Dimensions: 3.559" Diameter, 8.902" Length, 42 Ounces