What's the difference between a lens labeled "Macro" and one that isn't?

Started Aug 3, 2012 | Discussions thread
photonius
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Re: What's the difference between a lens labeled "Macro" and one that isn't
In reply to Jos van Eekelen, Aug 3, 2012

Jos van Eekelen wrote:

Macro lenses tend to be flat field as opposed to normal lenses that have a curved field. Check the details of the Sigma lens, 24 mm f/1.8 macro is strange, both with regard to focal length and f-stop.

These are not macro lenses, just normal lenses that focus relatively close, so marketing slaps a "macro" on it.
http://photonius.wikispaces.com/Close-up+%26+Macro
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