"macro switch that changes the lens to macro"
Well these are not true macro lenses as they normally give a maximum magnification of 2-1, where as true macro is 1-1 or greater.
I use the Canon 100mm f/2.8 and can confirm that it's one super lens (will post an example this evening).
I also use the Sigma 180mm f/3.5 mainly for shooting bugs and butterflies, although the results are very good, they don't come up to the standard of the Canon
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