Reviews and Problems with Sigma 18-250mm F3.5-6.3 DC OS HSM
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23 June 2011
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
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. It's therefore a lens which takes a slightly different approach than usual to the 'all-in-one' superzoom concept, trading off absolute sharpness against other desirable optical characteristics, namely relatively low distortion and chromatic aberration.
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
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 (SLD), an internal focusing design that facilitates use of lensbarrel accessories, and an extra 50mm.
Pros: You want a lightweight all-round lens with a competitive price tag., You want a zoom lens that can be used with polarisers and graduated filters., You require good flare resistance in backlit situations., You want effective image stabilisation for both the viewfinder image and the capture system. Buyers of all-in-one zoom lenses will welcome the arrival of Sigma’s 18-250mm F3.5-6.3 DC Macro OS HSM lens, which has just been released. Smaller and lighter than its predec...
Cons: You have a camera with a 'full frame' (36 x 24mm) image sensor., You need a fast lens across the focal length range for shooting action in dim lighting. Don't buy this lens if:, You have a camera with a 'full frame' (36 x 24mm) image sensor., You need a fast lens across the focal length range for shooting action in dim lighting.
Excerpt: This 13.8x superzoom lens is compatible with Canon, Nikon, Pentax, Sony and Sigma DSLRs that have an APS-C sized sensor or smaller. On a Canon APS-C format camera, this lens provides an angle of view equivalent to a 28.8-400mm lens on a 35mm camera and costs around £400.
Pros: Very good performance for a superzoom, Effective optical Stabilisation, Compact size, Light weight, Good build quality
Cons: f/6.3 max aperture at 250mm is relatively slow, No full time manual focus override (which isn't really much of an issue)
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. The situation has changed significantly lately, though, and two factors contributed to that change.
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.
Summary: A compact 13.9x wide-angle zoom lens for DSLR cameras with APS-C-sized image sensors.Sigma's new 18-250mm f/3.5-6.3 DC OS HSM is designed as an all-in-one lens for digital photographers with APS-C-sized (DX) sensors who don't want to carry more than one lens. Covering focal lengths ranging from the 35mm equivalent of 27mm to 375mm with most camera brands (28.8mm to 400mm on Canon bodies) it offers a 13.8 times zoom ratio.