Expectations for Sigma 10-20 f4.0 to 5.6 unrealistic?

Started 10 months ago | Questions thread
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HawaiiMike
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Expectations for Sigma 10-20 f4.0 to 5.6 unrealistic?
10 months ago

I am a beginner photographer.  I purchased a Sigma 10-20 recently and it seems softer than my other lenses, e.g. kit 18-50 WR at 18 mm.  I'm not sure if this is just the a feature of wide angle lens or if I could do better with another copy of the lens.  I took some photos off a tripod of the flat side of a house (with cluttered yard), single focus point on the rusty cleat in the 4 x 4 dividing the screen panels.  Attached are some pics wide open and stopped to f8.  Is this typical resolution for this type of lens?  Do I need to stop this lens down further than f8 to get improved sharpness?

Thanks for any opinions on the lens (I know the subject matter is lacking!).

10mm f4

10mm f8

20 mm f5.6

20mm f8

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