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Canon EF 100-300mm f/4.5-5.6 USM
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DESCRIPTION

Focal Length & Maximum Aperture: 100-300mm 1:4.5-5.6
Lens Construction:  13 elements in 10 groups
Diagonal Angle of View: 24º - 8º 15'
Focus Adjustment:  Rear focusing system with USM
Closest Focusing Distance: 1.5m / 4.9 ft.
Filter Size:  Rotating type
Max. Diameter x Length, Weight: 2.9" x 4.8", 1.2 lbs / 73.0 x 121.5mm, 540g
LEGEND
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.
USMUltraSonic Motor
EFElectro-Focus. EF-series lenses for Canon EOS series. Bayonet mount with three outer lugs.

Comments
by Peter Kun Frary
http://emedia.leeward.hawaii.edu/frary/toolbox3.htm
Comparison
by Bob Atkins
http://www.bobatkins.com/photography/reviews/x-300.html
Reviews
by The Digital Picture
http://www.the-digital-picture.com/Reviews/Canon-EF-100-300mm-f-4.5-5.6-USM-Lens-Review.aspx