Canon initiated the EF lens line in March 1987 as part of the
innovative EOS system with the underlying development concept of
fusing automatic and manual operation. Heralding a new era in SLR
photography, the EF lenses with built-in focusing motors were the
first to communicate completely electronically with the camera
body. Followed by the high optical performance L-series,
incorporating the silent Ultrasonic Motor (USM) and at a later
stage the world's first interchangeable SLR lens with an image
stabilizer, the EF lens series today is the largest line-up in the
autofocus SLR world. 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 marketed in 1991, 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.
General
Lens
| Focal Length Range (f-f): |
100
|
| Lens Structure (elements/groups): |
8/12
|
| Magnification: |
0.14 x
|
Physical Specification
| Filter Size: |
5.8
|
| Weight (kg): |
0.6
|
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