IMHO u sh sell sigma n get something better

failed? meaning?

remember that there is a minimum focusing distance (500mm) that comes with the lens, even if you macro. Just as long you are in the MFD, you should be able to macro. However, don't expect full macro, you get like 1:3 ratio only, so it is actually kinda closeup

if auto focus don't really work in your way, try manual focus, or just set at infinity and move in and out of the object

bros.. need some help.. my camera suddenly cannot switch on.. any1 face this problem before? just get the cam less than 3 days.. >.<