- 100mm macro USM lens with f/2.8 maximum aperture for Canon SLR cameras
- Secondary diaphragm blocks stray light at f/2.8 for increased contrast
- Ultra-sonic monitor provides outstanding autofocusing speed at all distances
- 3-group floating system for exceptional close-up performance; full-time manual focus
- Measures 3.1 inches in diameter and 4.7 inches long; weighs 21.1 ounces; 1-year warranty
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