Can anyone explain to me, Sigma 28-300mm f/3.5-6.3 Compact Aspherical Hyperzoom and Sigma 28-300mm f/3.5-6.3 Macro lens, what's the different between them? For Sigma 28-300mm f/3.5-6.3 Macro lens, is it able to take macro and also able to act as a normal zoom lens or it's only for macro use?