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Canon EF 300mm f/4.0L USM
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DESCRIPTION

Lens Construction (elements/groups): 8/7
Diagonal Angle of View: 8° 15'
No. of Diaphragm blades: 8
Minimum Aperture: 32
Closest Focusing Distance (m): 2.5
Filter Diameter (mm): 77
Max. Diameter x Length (mm)  90x213.5
Weight (g)  1,165
LEGEND
USMUltraSonic Motor
LThese lenses use special optical technologies [such as] Ultra-low Dispersion UD glass, Super Low Dispersion glass, Fluorite elements, and Aspherical elements
EFElectro-Focus. EF-series lenses for Canon EOS series. Bayonet mount with three outer lugs.

Reviews
by Bob Atkins
http://www.photo.net/equipment/canon/300-4
by PhotoZone (tested on Canon EOS 350D)
http://photozone.de/8Reviews/lenses/canon_300_4/index.htm
by The Digital Picture
http://www.the-digital-picture.com/Reviews/Canon-EF-300mm-f-4.0-L-IS-USM-Lens-Review.aspx
by Peter Kun Frary
http://emedia.leeward.hawaii.edu/frary/canon_ef300usm.htm