Lens Info:

Another telephoto macro lens with a maximum magnification of 1x. Life-size close-ups can be taken from a farther distance without disturbing the subject (insects, etc.). The internal floating system minimizes fluctuations in aberrations caused by changes in the focusing distance. Optical performance is outstanding from 1x to infinity.

Julius's Take:

This is the ultimate in macro lenses, with a focal lenght of 180mm and the build quality of an "L" lens, you know you're getting the best quality picture without getting too close to the subject. This is not a light weight lens, weighing in at 2.4 pounds, hand holding will become an issue after a while so a tripod is recommended. Focusing is also slower than most "L" lenses but in macro photography you'll be doing manual focusing for the most part so this isn't an issue. However, the longer reach of 180mm, the "L" quality lens and the background blur that this lens creates makes this the ultimate in macro lenses. It's definately worth trying out.

Tech Specs:

Focal Length & Maximum Aperture	180mm 1:3.5
Lens Construction	14 elements in 12 groups
Diagonal Angle of View	13° 30'
Focus Adjustment	Inner focusing system with USM
Closest Focusing Distance	0.48m / 1.6 ft.
Filter Size	72mm
Max. Diameter x Length, Weight	3.2" x 7.3", 2.4 lbs. / 82.5 x 186.6mm, 1090g