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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.

Leitz (Leica) Elmarit-R 180mm f/2.8 (1967) (first try)   lens very 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)   lens 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) Summilux-R 50mm f/1.4 (1976)   lens badly 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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