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Badly assembled lenses and image quality

 
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My 50mm and my 180mm vintage lenses arrived wrongly assembled: they couldn't focus to infinity. The 50mm I reassembled it myself. The 180mm I sent it back to be serviced; it came back much better, but still with no infinity focus, so I reassembled it too. Now both lenses focus to infinity... and beyond (I'm not a pro, just reasonably good with mechanical things such as these).
In the tests down here you can see what impact this wrong assembly had in image quality: both focus and bokeh were affected, sometimes quite severily.




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Leitz (Leica) Elmarit-R 180mm f/2.8 (1967) (first try)
 
lensvery badly assembled"correctly" assembled
f/2.8 center
f/3.5 center
f/5.6 center
f/9.0 center
f/2.8 corner
f/3.5 corner
f/5.6 corner
f/9.0 corner
f/2.8 bokeh
f/4.0 bokeh
f/5.6 bokeh




Leitz (Leica) Elmarit-R 180mm f/2.8 (1967) (second try)
 
lensbadly assembled"correctly" assembled
f/2.8 center
f/3.5 center
f/5.6 center
f/9.0 center
f/2.8 corner
f/3.5 corner
f/5.6 corner
f/9.0 corner
f/2.8 bokeh
f/4.0 bokeh
f/5.6 bokeh




Leitz (Leica) Summilux-R 50mm f/1.4 (1976)
 
lensbadly assembled"correctly" assembled
f/1.4 center
f/1.8 center
f/2.2 center
f/2.8 center
f/3.5 center
f/5.6 center
f/9.0 center
f/1.4 corner
f/1.8 corner
f/2.2 corner
f/2.8 corner
f/3.5 corner
f/5.6 corner
f/9.0 corner
f/1.4 bokeh
f/1.8 bokeh
f/2.8 bokeh
f/4.0 bokeh
f/5.6 bokeh




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