5 of 6 people found the following review helpful
Versatile all purpose workhorse lens but not optimal quality.,
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This review is from: Sigma 18-250 mm f/3.5-6.3 DC Macro OS HSM Lens for Canon (Electronics)
This lens was initially ordered to be used with a Canon EOS 400D but produced consistently soft shots. Tried testing it against other Canon lenses of comparable focal length, using the same Canon body and with the stabilizer on and off, auto and manual focus etc. and established only that there was nothing wrong with the camera body. Images were marginally sharper with the stabilizer off but still not optimal.
I then decided to upgrade to a Canon EOS 70D (for the additional video facility) and found that though the results were considerably improved, possibly because of the superior 70D auto-focus technology, or larger sensor, or both, the lens still produced shots that were very slightly soft (more so at the edges), especially when compared with the pin-sharp Canon lenses.
When used with a high quality DLSR, this lens might be a good budget option. It is compact in size and has great range. And the 'look' it produces might be attractive to some. That said, it seems a shame to compromise a high-quality camera with a less than optimal quality lens.
I can't speak for the Nikon mount versions, which may produce better results but for Canon cameras, I would have to recommend the admittedly more expensive Canon lenses.