Focus tuning.
However, some people find a need to adjust lots of lenses. Some, like myself, have never found such a need. When I do, I'll run the appropriate tests and make adjustments. With a zoom it will be a compromise as it may differ at different focal lengths and distance settings.
The difference is staggering.
If your pictures are now sharp, and they seem to be, then the job is done.
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2322 posts
10 years
Wicklow Ireland
http://photographylife.com/how-to-quickly-test-your-dslr-for-autofocus-issues
Result was Da* 60-250 needed +5. samsung dxenon 100mm Macro was fine. Da* 55mm f1.4 needed +10. and Pentax F 28mm f2.8 needed +7.
I feel surprised that out of 4 lenses the only one that was spot on was not a Pentax, ( even if it is just a re badged Dfa 100mm) Is this unusual ???