This was true because most third party lens makers like Tamron, Tokina or Sigma built their lenses to a budget to compete against the big companies like Canon and Nikon, which produced excellent but consequently more expensive lenses.
Back in the days of film, deficiencies in lenses weren't that obvious since most people could only assess the quality of their lenses when they printed their photos and most of us very rarely went beyond 3 x 6in or 8 x10in prints.
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