This telephoto macro lens is capable of focusing to life-size (1X) without attachments. Although it replaces the EF 100mm f/2.8 macro lens, it is a completely new design. It incorporates a ring-type USM giving quiet, high-speed autofocus. The full-time mechanical manual focus gives very smooth manual focusing. For the first time in a 1X focusing telephoto macro lens, inner focusing is used.The lens length remains constant and a long working distance of 149mm makes worrying about getting too close to the subject unnecessary. Also, during focusing the front ring does not rotate making use of front-mounting accessories like macro ring lites simple and effective. "Three-group floating" focusing construction uses three independently moving groups, which holds focusing-related changes of aberrations to a minimum giving excellent image quality all the way from infinity to life size.* Brand: Canon
* Model: 100mm Macro USM EF
* Dimensions: 2.13" h x 2.13" w x 2.99" l, 1.80 pounds
* 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
0 ความคิดเห็น:
Post a Comment