Excerpt: Take one of Canon's most popular lenses, the Canon 70-200mm f/4 L , add an up-to-4-stop Image Stabilizer and you get the Canon EF 70-200mm f/4 L IS USM Lens. If you don't need the subject-action-stopping and background-blurring capabilities of the faster Canon EF 70-200 f/2.8 L IS Lens , this lens will deliver everything else you need in a smaller, lighter and less-expensive package.
Canon EF 70-200mm f/4 USM L IS (full format) - Review / Test Report
23 January 2009
Conclusion: The Canon EF 70-200mm f/4 USM L IS is an amazing lens. It is truly outstanding when used on APS-C DSLRs and it suffers only from a minor quality deteriorations on full format DSLRs. The resolution figures are easily on prime levels throughout the whole range and even at max. aperture. Unlike most other full format lenses it manages to keep the vignetting on a moderate level. Lateral CAs and distortions are usually also nothing to worry about.
Conclusion: The Canon EF 70-200mm f/4 USM L IS is capable to deliver a near-flawless performance is all categories. The resolution figures are very impressive even at max. aperture. Distortions, vignetting and CAs are usually nothing to worry about either. The build quality is excellent with the new sealing as a another highlight.
Canon EF 70-200mm f/4 USM L IS - Review / Test Report
29 September 2007
Conclusion: Every now and then EOS, the goddess of mercy, seems to speak to the Canon lens designers and this time they listened carefully. The Canon EF 70-200mm f/4 USM L IS may well be the very best tele zoom on the market today - it is certainly the best Canon zoom lens tested locally to date. The lens was capable to deliver a near-flawless performance is all categories. The resolution figures are stunning regardless of the setting.