Reviews and Problems with Sigma 18-250mm F3.5-6.3 DC OS HSM
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20 November 2012
Summary: The Sigma 18-250mm F3.6-6.3 DC Macro OS HSM is one of the best of the current bunch of SLR superzooms, with decent optics, fast autofocus and effective image stabilization. It's a reliable performer, and its close-up capability is handy too.
Pros: 13.9x focal length range with impressive closeup capability, ideal general purpose / travel lens, Fast, quiet autofocus, Effective image stabilization (about 3 stops benefit at all focal lengths), Good build quality, smooth zoom ring action and limited zoom creep
Cons: Somewhat soft wide open in the middle of the zoom range, Very strong pincushion distortion across much of the zoom range
Summary: Sigma introduced this lens in 2009, as an upgrade to its 18-200mm lens. The lens comes in Sigma, Canon, Nikon, and Pentax mounts, and it includes optical stabilization (as denoted by the "OS" in the lens' title).
Conclusion: The Sigma 18-250mm F3.5-6.3 DC OS HSM, perhaps unsurprisingly, seems very much to be a case of 'take the 18-200mm OS , make it longer', and exhibits much the same characteristics as the older design.
Pros: Huge 13.9x focal length range, ideal general purpose and travel lens, Good image quality in the wide to short telephoto range, Fast, quiet autofocus, Low distortion (for a superzoom), Good build quality, smooth zooming action and no zoom creep
Cons: Very inconsistent sharpness through the zoom range - extremely soft at 135mm, Soft corners at almost all focal lengths, Image stabilization not as effective as on similar lenses, especially at telephoto end
Summary: Although it is by no means perfect, the built-in optical stabilisation technology and superior image sharpness of the Sigma 18-250mm makie it a strong contender for anyone considering an all-in-one superzoom lens.
Excerpt: At 13.8X, this digital-only 29-400mm equivalent (on DSLRs with 1.6X lens factors) offers the broadest zoom range of any Sigma lens. Joining Sigma's first digital-only superzoom of 2004, the 18-200mm, this $530 (street) lens adds optical stabilization (OS), four elements of super-low-dispersion glass...
Excerpt: Originally posted 2011-03-23 on Optyczne.pl Even several years ago lenses with 10-15x zoom multiple were those products I wouldn’t recommend to anybody. Often shoddily made devices (with the exception of the Canon L-series lens), they provided images of average or weak quality.
Cons: weak image quality on the edge of the frame at 120-250 mm focal lengths,, high chromatic aberration at the maximum focal length,, weak performance against bright light.