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Canon EF 28-135mm f/3.5-5.6 IS USM

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DESCRIPTION

Standard zoom lens with an Image Stabilizer and high zoom ratio. With the Image Stabilizer turned on, you can obtain sharp, natural-looking pictures in dim lighting without using flash or a tripod. Very handy for places where flash is prohibited. Uses ring-type USM for swift, silent autofocus and full-time manual focus. Closest focusing distance is 20 in. (50 cm).
Focal Length & Maximum Aperture: 28-135mm 1:3.5-5.6
Lens Construction:  16 elements in 12 groups
Diagonal Angle of View: 75º - 18º
Focus Adjustment:  Inner focusing system with USM
Closest Focusing Distance: 0.5m / 1.6 ft.
Zoom System:  Rotating type 
Filter Size:  72mm
Max. Diameter x Length, Weight: 3.1" x 3.8", 18.9 oz. / 78.4 x 96.8mm, 540g
LEGEND
ALA special lens element with a surface curved with the ideal shape to correct spherical aberrations, i.e., a lens having a free-curved surface which is not spherical, is called an aspherical lens.
FTMFull Time Manual Focus. This allows the lens to be manually focused without leaving automatic focus mode and without damaging the lens. This works best with cameras that can shift the autofocus from the shutter release to another button.
I/RInner/Rear focusing ring. Focusing is performed by moving one or more lens groups positioned between the front lens group and the diaphragm.
ISImage Stabilizer. Allows the lens to sense movement from "shake" or vibrations, and instantly apply an optical correction by moving a group of lens elements.
USMUltraSonic Motor
EFElectro-Focus. EF-series lenses for Canon EOS series. Bayonet mount with three outer lugs.

by Bob Atkins
http://bobatkins.com/photography/reviews/canwide.html
by Bob Atkins (Canon's EF 28-90/105/135 zoom lenses)
http://bobatkins.com/photography/reviews/28zooms.html
by www.tawbaware.com
http://www.tawbaware.com/canon_lens_test.htm
by David J. Herzstein
http://www.kjsl.com/~dave/lenstest/lenstest.html
by Mark D. Segal (28-135 IS vs. 24-105 IS)
http://www.luminous-landscape.com/reviews/lenses/24vs28.shtml
by PhotoZone.DE
http://photozone.de/8Reviews/lenses/canon_28135_3556_is/index.htm
by The Digital Picture
http://www.the-digital-picture.com/Reviews/Canon-EF-28-135mm-f-3.5-5.6-IS-USM-Lens-Review.aspx
by Peter Kun Frary
http://emedia.leeward.hawaii.edu/frary/toolbox2.htm
by William L. Castleman
http://www.wlcastleman.com/equip/reviews/28_135zoom/index.htm