Back on July 12, Nikon announced the 40mm/f2.8 DX macro lens: http://www.photo.net/nikon-camera-forum/00Z1gd Recently they sent one to photo.net for us to review, and I have been playing with it for the last couple of days. (It is a loaner that I need to send back after a month.) Unlike the more expensive 60mm/f2.8 AF-S macro for FX, the new 40mm DX has no ED elements and no aspheric elements. So originally, I had some concerns about chromatic aberration (CA) and distortion. I am glad to find very little distortion and CA is very well controlled, unlike the 35mm/f1.8 DX AF-S. I have also tried this lens on the full D700 frame, and sure enough, the corners are totally dark. Moreover, the image circle outside of the DX area gets poor quickly, especially in the corners. Lens construction is all plastic similar to the 50mm/f1.8 AF-S and 35mm/f1.8 DX AF-S, but I think it is sufficient. The lens mount is metal with the rubber gasget to seal out moisture. Its AF-S is true AF-S where you can manually override it without switching to manual focus. This lens extends out quite a bit when it reaches 1:1. See the attached image. We are planning to write a fully preview later on. However, personally I have no plan to buy this lens myself, as I prefer longer macro lenses for more working distance.