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Friday, September 11, 2009

Canon EF 100mm f/2.8 Macro USM Lens for Canon SLR Cameras

Bring small things into full-sized view with the Canon EF 100mm macro USM lens. Macro lenses can uncover detail that would be impossible to detect by the eye and give new perspective to extremely minute subjects such as insects or the petals of a small flower, and this lens is no exception. The lens offers such features as a three-group floating system for exceptional close-up performance; a secondary diaphragm that blocks stray light at f/2.8, which increases contrast when shooting wide open; a ultra-sonic monitor (USM) that provides outstanding autofocusing speed at all focusing distances; a wide manual focusing ring with smooth action; and full-time manual focus even in AF mode. The first lens in its class to feature inner focusing, the lens carries a one-year warranty.

Technical Details :
* 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.

* Focal length: 100mm
* Maximum aperture: 1:2.8
* Lens construction: 12 elements in 8 groups
* Diagonal angle of view: 24 degrees
* Focus adjustment: Inner focusing system with USM
* Closest focusing distance: 1 foot (film plane to subject)
* Filter size: 58mm
* Dimensions: 3.1 inches in diameter, 4.7 inches long
* Weight: 21.1 ounces

This is the lens I leave on my camera for general purpose use. At non-macro focus distances, it is a very fast lens in a convenient short-telephoto length. The images are sharp out to the corners. This is one of those great Canon lenses that probably deserves an L-series rating but is available without the red stripe and exorbitant cost. There is a lot of glass in this lens - it is heavy. I highly recommend buying the tripod collar as it allows you to attach the camera and lens to a tripod or ballhead with much better balance. If you plan on using the macro functionality, keep in mind that the effective f-stop of the lens goes way up when you're focusing at very close range. At 15cm from the front surface, it performs as though it were an f/9.

Canon EF 100mm f/2.8 Macro USM Lens for Canon SLR Cameras

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