Understand that the mentioned len is a standard len. It can be used wide angle as well as telephoto. But is the Macro feature sharp enough to compare with those like Tamron SP AF90MM F/2.8 Di Macro? Or it is better used as a walk around len ? Thinking of getting one for travelling/walk around as well as macro taking. Any advice to a newbie. My camera is a Canon EOS350D. Thanks.