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Canon EF 70-300mm f/4-5.6 IS USM
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DESCRIPTION

Lens Construction: 15 elements in 10 groups
Diagonal Angle of View: 84° - 23° 20' (with full-frame camera)
Focus Adjustment: Front-focusing method with helicoid ring drive
Closest Focusing Distance: 4.9 ft./1.5m
Zoom System: 6-group helical zoom (rotational angle: 84°)
Filter Size: 58mm
Max. Diameter x Length, Weight: 3.0 in. x 5.6 in., 22.2 oz. / 76.5mm x 142.8mm, 630g (lens only)

LEGEND
CACircular Aperture. A new diaphragm unit, which uses curved aperture blades to provide for a more rounded opening as the lens is stopped down. It's especially effective at rendering out of focus background highlights as natural rounded shapes.
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.
UDUltralow Dispersion glass. A digit after the 'UD' abbreviation means a number of UD glasses in the lens.
USMUltraSonic Motor
EFElectro-Focus. EF-series lenses for Canon EOS series. Bayonet mount with three outer lugs.

Reviews
by 16:9
http://16-9.net/lens_tests/canon_70_300mm.html
by Bob Atkins
http://bobatkins.com/photography/reviews/ef_70_300is_review.html
by PhotoZone.DE
http://photozone.de/8Reviews/lenses/canon_70300_456is/index.htm
by The Digital Picture
http://www.the-digital-picture.com/Reviews/Canon-EF-70-300mm-f-4-5.6-IS-USM-Lens-Review.aspx