My Lens Is A Bad Copy

Back in May, I wrote a post entitled "I Have A Bad Copy Of Lens X", which referred to an article written by Roger Cicala about the variances and tolerances involved with the manufacture of cameras and lenses and how these factors play into the conclusion that a particular copy of a given lens is 'soft'.  Cicala has now written an excellent summary article on the same topic that incorporates  many of his former writings on the subject into one concise piece. If you have ever wondered about the validity of 'soft' or subpar copies of a lens, this is the place to learn about some of the realities involved.  The article is entitled "Variation Facts And Fallacies".