Introduced late 2005, the EF 24-105 4L IS USM is an astonishing feat of engineering with Image Stabilization, constant aperture, wide zoom range (4.4x), beefy construction and weather seals. I bit the bullet and replaced my oft and long used travel companion, the EF 28-135 3.5-5.6 IS USM, with this amazing optic. Here’s the conclusion of the lens review from Peter Kun Frary:

“This is the best zoom I have used. It is sharp and contrasty wide open at all focal lengths. It is sharper than my EF 50 1.4 USM at 50mm F4. It’s also sharper than my EF 70-200 4L USM at 105mm F4. Unfortunately, like most wide zooms, it suffers from barrel distortion at the wide end and pincushion distortion at the long end. In this aspect it’s about the same as my old EF 28-135 IS USM.

This is the big Kahuna of normal zooms. It’s exceedingly well made and sharp as a tack. It swept me off my feet and displaced my oft and long used companion, the EF 28-135 3.5-5.6 IS USM. I love the range, AF speed, sharpness and feel of this lens. It balances perfectly on larger bodies such as the EOS 3 or 5D. It may be front heavy on smaller such as Rebels and Elans, so you should try before buying.

Highly recommended serious amateurs, doctors, lawyers and world trekkers. Not recommended for those wishing to travel light, sports photographers or those with a feeble credit card limit.”

Website :  Canon EF 24-105 4L IS USM Review by Peter