Hmm does the lens do the blurring itself automatically? I mean.. it seems to only really focus on the center part of the picture. But for macro shots it's not always necessary and sometime you want to keep everything in focus. For example in your pictures here I like the first and third photograph but on the second one I don't understand is it because of the lens that it seems to be out of focus or maybe you should try using tripod to avoid any movement that could cause the blur.