Kevin, if your plan is/was to use it for macro, try to stop down quite a bit more. f/4 isn't nearly enough when you are so close to your subject for macro. Please give it another chance. If you didn't mount your camera on a tripod, give that a try, too. The flower's petals look a little blown which is why they lack detail. I don't have that lens and never used one, but it might be able to do more for you with a little practice. Have some fun with it, and give it another go!