For Sharpness
1. Shoot in the middle of the zoom range
2. Stop down to f/8
3. Mount on tripod
4. Use one focus point
5. You'll now be able to find the lens' hot spot, If any other images are considerably worst you may have a bad copy.
For Focusing
1. Aim at focus point
2. Take photo
3. If the focus point was in the foreground, but the background is more in focus, then the lens ahs focusing issues.
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