Hi Guys, I have a Nikon D100 with a 28-200 (3.5-5.6 I think) Nikkor lens. This lens does not have macro feature. I saw this on Ebay and thought this would be a cheap way to solve my macro problem, without buying a macro lens. Has anyone used these lens adapters before? How well do they work? What are the drawbacks compared to a macro lens? At this price, there's gotta be a catch. Thanks in advance.