Conclusion: The EF-S 18-200mm F3.5-5.6 IS is a lens which many Canon users have been waiting for with great anticipation, as an ideal 'all-in-one' lens for travel and 'walkaround' use. In the flesh it behaves much as we'd expect from such an ambitious design, as an 11x zoom range will always necessitate some fairly major optical compromises.
Pros: Huge 11x focal length range, ideal general purpose and travel lens, Excellent image stabilization system, consistently delivering three to four stops benefit, Good central sharpness at all focal lengths (but inconsistent corners), Attractive rendition of out-of-focus regions of the image, Improved build quality in comparison to the 18-55mm and 55-250mm kit lenses, Well-placed zoom lock switch
Cons: Poor sharpness across much of the frame at 18mm and wider apertures, Pronounced barrel distortion at wideangle, and pincushion distortion around 50mm, High levels of chromatic aberration at either end of the zoom range
Excerpt: A 29-320mm equivalent on APS-C Canon EOS models, this lens ($700, street) boasts the broadest zoom range of any interchangeable optic from Canon to date: 11X. A high-end kit option for EOS 50D owners, it probably owes its existence to the phenomenal success of Nikon's 18-200mm f/3.5-5.6 VR Nikkor. And with the debut of Tamron's far-reaching and stabilized 18-270mm f/3.5-6.3 lens (tested in this issue), an 11X Canon may be just the beginning.
Summary: Canon’s EF-S 18-200mm IS is quite simply the lens many Canon DSLR owners have been waiting for. It equips EF-S compatible models with a massive 11.1x optical zoom range, equivalent to 29-320mm, and crucially includes Image Stabilisation to iron out any camera shake. By delivering wide angle to decent telephoto coverage, it could be the only lens many owners will ever need.
Like other super-zoom lenses, this massive range brings enormous compositional flexibility.
Pros: Enormously flexible 11.1x optical range., Effective Image Stabilisation., Lock control to prevent barrel from extending., End section doesn’t rotate when focusing.
Cons: Noticeable barrel distortion at 18mm., Softness and fringing in corners., No USM focusing or full-time MF., Some creep on the barrel.
Excerpt: The Canon EF-S 18-200mm f/3.5-5.6 IS Lens features an awesome focal length range (one that completely covers the needs of many photographers) and an excellently-performing IS system in a nicely-sized body.
Excerpt: Originally posted 2011-06-12 on Optyczne.pl There are a lot of 18-2xx mm class lenses available on the market. Tamron offers as many as three such devices, there are two Sigmas, one Pentax, one Sony and one Nikkor (although, to be honest you must add that Nikon has launched two other lenses in this series lately). Compared to that rich choice the Canon’s offer looks modest - only in August 2008 that company launched the EF-S 18-200 mm IS model.
Cons: average image quality on the edge of the frame,, chromatic aberration corrected weakly,, significant distortion,, huge vignetting,, distinct astigmatism at the shortest focal length,, modest accessory kit.
Canon EF-S 18-200mm f/3.5-5.6 IS - Review / Test Report
31 October 2008
Conclusion: Canon had a somewhat weird timing regarding the release of their EF-S 18-200mm f/3.5-5.6 IS. It is extremely difficult to design such a lens to start with and more so under low-cost requirements. Combine these side conditions with the rather extreme quality requirements of a high resolution APS-C DSLR a la EOS 50D (@ 15mp) and this sounds like trouble. The Canon lens has a couple of weak spots.