I picked up a 12-50 recently to copy some old slides, as several have mentioned doing. I got the Polaroid Adapter, which functions well, but I am unable to fill the frame with the 35mm slide - I think the distance from screw-on lens adapter to the slide holder is a bit too much. I end up cropping the image resulting in only10 megapixels. I think this is enough to capture the vast majority of the detail of these old slides, few of which are really good - those were scanned years ago; but I want to image and save the rest for sentimental reasons. The corners aren't acceptable with the 12-50 until I go to about f/11, but that's where the center begins to deteriorate. So two questions: Have any of you who've done this used the Polaroid adapter? Would I be better ditching it for the Nikon (unavailable when I ordered). Would you recommend just getting the 60mm macro? I know it's a better lens, no question. Would it fill the frame while using the Polaroid adapter, or should I get the Nikon? It is a pretty versatile lens, all things considered. Thanks for any input.