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Canon EF 100mm f/2.8 Macro USM
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DESCRIPTION

Autofocus lens for macro photography up to life-size (1x) magnification. Inner focusing affords a long working distance of 5.9in. (149mm) at 1x. A 3-group floating system results in excellent delineation at all focusing distances. Ring USM for silent and high-speed AF, and full-time manual focusing also provided. The optional Tripod Mount Ring (B) B (with adapter) enables the lens to be rotated for vertical or horizontal framing.

Focal Length & Maximum Aperture: 100mm 1:2.8
Lens Construction:  12 elements in 8 groups
Diagonal Angle of View: 24º
Focus Adjustment:  Inner focusing system with USM
Closest Focusing Distance: 0.31m / 1ft. (film plane to subject)
Filter Size:  58mm
Max. Diameter x Length, Weight: 3.1" x 4.7", 21.1 oz. / 79.0 x 119.0mm, 600g

LEGEND
FloatFloating elements are a relatively reliable indication for a good performance towards closer focus distances.
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.

Comparison
by Richard Harris (with Tamron SP AF 90mm f/2.8 DI Macro)
http://photo.net/equipment/canon/can-tam-macro/
by Dr. Horst Kretzschmar
http://orchideen-kartierung.de/Macro100E.html
Reviews
by The Digital Picture
http://www.the-digital-picture.com/Reviews/Canon-EF-100mm-f-2.8-USM-Macro-Lens-Review.aspx
by Photography in Malaysia
http://mir.com.my/rb/photography/hardwares/classics/eos/EF-lenses
/EF100mmf28MACRO/index.htm