I got one attached to a camera I wanted, and telezooms are not my cuppa so I was looking to sell it, but in order to test it for defects before writing the listing, I did a couple of snaps of the garden out of the window, and... wow. This thing is really surprisingly sharp. Of course it's on the slow side of the consummer products, but I'm really tempted to keep it. And also it's so ridiculously light that I could hand hold it @150mm for almost a second without visible blur on the e-m5. Now I'm torn... M.