... Well, I understand the meaning of the word. But what does it
actually mean in the lens designation?

The new Sigma 18-250 lens is called "macro" "with a maximum
magnification ratio of 1:2.9":
http://www.dpreview.com/news/2012/06/15/Sigma-launches-18-200mm-F3-5-6-3-Macro-HSM-superzoom-lens

One of my older version Tamron zooms (70-300/4-5.6) and Sigma 24mm /1.8 EX DG  
are also marked as "Macro". 
While Sigma 24/1.8 goes to short focusing distances (about 18 cm / 0.6
ft), Tamron - doesn't (the shortest focusing distance is about 50 or 70 cm).
In contrast, D FA 100/2.8 Macro - has a clear long tail of focusing
distances where you achieve the macro regime.

So, what is necessary and sufficient for a lens to be called macro?

Igor


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