Quality control, sample variation and what it means for photographers

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Perhaps the most problematic series of lenses I’ve ever owned. Like the fable, when they’re good – they’re really good; when they’re bad, they’re horrible.

An increasingly heard phrase amongst photographers and gear collectors is “it’s a good copy” or “it’s a bad copy”: today’s article explores what this actually means, as well as how it is relevant in real terms.

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