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A lot of new lens for auto focus have problems with alignment because they have to make the bodies very loose so the small motors can drive them. It becomes more obvious when you have the aperture full open.
I use a collection of old lens for serious work because they are much more stable. My favourite is a Carl Zeiss Jena from the 60's with a screw mount that I use with an adapter to mount to my DSLRs. It is 135mm in a solid aluminium body and only two elements.
For happy snaps I use the auto focus lens that came with the cameras.
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