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| p.4 #19 · Zeiss ZE/ZF.2 35mm f/1.4 (according to Roger Cicala/lens rentals.com) |
Leica uses tighter tolerances in their designs than most manufacturers these days, which is part of the difficulty. They use both machines and manual labour for assembly, and make many of the machines themselves, as do/did Zeiss. I have read somewhere that their tolerances are up to 10 times tighter than usual for lens production, but I don't have a source for that. Leica, possibly more than any other lens manufacturer today, still values compact size, and much of their tolerances are taken up with this, but the levels of CA compared to the main competitors are also often much lower. The largest part of the high prices on a Leica lens goes towards supporting this labour-intensive process, not towards extra quality control, and yes, Leica lenses do seem to need adjustment (too?) frequently. However, Leica really stands behind their product, so apart from time constraints, no one should worry about the performance of their lenses. Leica will set it right again, if it needs it.