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Canon EF 100 mm f/2.0 USM
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DESCRIPTION

This lens features a large aperture and compact size. The first lens group moves for rear focusing. And sharp, crisp pictures are obtained at all apertures. The background blur is ideal for portraits. The USM autofocuses the lens quickly and quietly.

Lens construction (elements/groups) 8/6  
No. of diaphragm blades 8  
Closest focusing distance (m) 0.9  
Maximum magnification (x) 0.14  
Filter diameter (mm) 58  
Max. diameter x length (mm) 75 x 73.5  
Weight (g) 460

LEGEND
USMUltraSonic Motor
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.
EFElectro-Focus. EF-series lenses for Canon EOS series. Bayonet mount with three outer lugs.

Comments
by Steve Rach Mirarchi
http://photo.net/equipment/canon/100-2
Comparison
by William L. Castleman
http://www.wlcastleman.com/equip/reviews/85_100_135/index.htm
Reviews
by PhotoZone (tested on Canon EOS 350D)
http://photozone.de/8Reviews/lenses/canon_100_2/index.htm
by The Digital Picture
http://www.the-digital-picture.com/Reviews/Canon-EF-100mm-f-2.0-USM-Lens-Review.aspx