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Owner reviews: Sigma AF 180 mm f/ 2.8 APO Macro
Amazing optical quality nice sharp at f/2.8 on full frame, great bokeh. And the cheap price.
Slow focus, cheap and really simple stupid mechanical quality. Big and heavy like a tank.
But if you are not in hurry for fast focus and is no problem for carrying with you this heavy lens, then the optical quality sharp and great bokeh photos will compensate you.