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Canon Zoom lens EF-S 17-85mm
with Image Stabilizer
The Mad Dog Voyager crew has chosen the
Canon EOS 20D camera
with a Canon EF-S 17-85mm zoom lens (with Image Stabilizer)
because of the quality and versatility of this combination to make
photos above and underwater
Details on the Canon EF-S 17-85mm f4-5.6
IS USM zoom lens with Image Stabilizer

Overview (As per Canon)
Equivalent to a 28-135mm lens, this new EF-S lens brings true wide-angle
and tele coverage to EOS 20D
and Digital Rebel shooters. It has Canon's Image Stabilization system,
allowing safe hand-holding at
speeds up to three stops slower than otherwise possible. And of course,
it's optically optimized for digital
SLRs. A ring-type USM means both fast and silent AF, as well as
full-time manual focus when in the AF
mode.
Features
- Compact, lightweight design with a 5x zoom ratio
(28 to 135mm equivalent)
- Excellent optical quality: Aspheric element with
two Aspherical
surfaces utilized
- Close-focusing to 1.15 feet -- at 135mm, fills the frame with subject
3 x 4.4 inches
- Ring-type Ultrasonic motor for superior AF performance; allows
full-time MF
- Image Stabilization extends the lens's usefulness in low-light levels
- Circular aperture design -- natural highlights, even stopped down two
stops
- Non-rotating front element; lens length does not change during zooming
- EF-S lens mount -- exclusively for EOS 20D and Digital Rebel bodies
Specifications
Focal Length & Maximum Aperture 17 - 85mm; 1:4-5.6
Lens Construction - 17 elements in 12 groups
Diagonal Angle of View - 78° 30' - 18° 25'
Focus Adjustment - Inner focusing system, with focusing cam
Closest Focusing Distance - 0.35m - 1.15 ft.
Zoom System - Ring USM
Filter Size - 67mm
Max. Diameter x Length, - 3.1" x 3.6". / 78.5 x 92mm
Weight - 16.8 oz / 475g
Diving with the Canon 20D digital SLR camera
The Mad Dogs use the Canon 20D digital SLR
camera with a Canon Zoom lens
(EF 75-300mm
with Image Stabilizer) in a
Ikelight underwater camera
housing for our diving trips
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