Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Superb Macro Lens

As Olympus E-system user I have found Sigma 150mm Macro Lens very useful when taking macro shots from a bit remote distance. OK, the f-stop is 2.8, and Zuiko 50 mm Macro Lens is 2.0, but in Zuiko case you have to approach very close to the subject. Making close-up shots of some dangerous animals (bugs, spiders, scorpions, etc), this could be life saving and, not for that only, I decided to buy Sigma lens. Moreover, sharpness is also, very good and, for that money, I never felt any regret for that.