Fujinon XF16mm-80mm F4 good copy / bad copy – but why?

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John356 Regular Member • Posts: 157
Fujinon XF16mm-80mm F4 good copy / bad copy – but why?

I have been in engineering design and manufacturing all my working life and just can’t fathom the often said “I have a good / bad copy of “ such and such a lens. This is now occurring with the new 16-80mm. In technical terms, unless actually defective modern manufactured products perform to a very similar level and variation is unnoticeable to the end user – I can’t envisage owners of say BMW Z4 M saying my one is a good / bad copy? There is actually a fairly well known Japanese technique (Taguchi loss function) that drives manufacturers to reduce variation – why is this not so in camera lens’s?
John

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