Is this a len's issue or a body issue? I've always thought this 28-135 was pretty soft unless stopped down to around f8 or so, maybe this is the reason.
Exif is still embedded but I'll post it anyways.
Tripod and Remote Shutter release was used
Canon Rebel XSi with Canon 28-135mm IS
IS was off for this test.
Aperture - f5.6
Shutter - 1/3rd
ISO - 100
Focal Length - 85mm
Around 6mm on the chart looks to be the most in focus to me.
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