Help: Canon Lens only sharp in the bottom half of images @ 55mm

Started 7 months ago | Discussions thread
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Cameranoobie
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Help: Canon Lens only sharp in the bottom half of images @ 55mm
7 months ago

Is this normal? Its the Canon 17-55 2.8 lens.

Ive been checking the sharpness throughout its entire focal range and it was good and evenly sharp from 17mm-50mm until at 55mm zoom, its noticably sharper in the bottom half and its blurry up top (most obvious at 2-8, 3.2, 3.5 and 4.0). This is VERY dissapointing, and not sure if i got a lemon or what. All I want to know is if this is normal.

I have ISO 1600, (even tried 3200 to see if it helped, nope), auto white balance off, raw format like I was suggested. My focus area is automatic, spread across all 9 focus points.  Yes I used a tripod.

Here are some samples.

55mm @ 2.8

55mm @ 3.2

55mm @ 3.5

55mm @ 4.0

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