I'm looking to finally add a new macro lens to my collection for close shots of wedding details (rings, flowers, table directions, etc) and I'm debating between Nikon's 40mm Macro and their older 60mm. I realize the 40mm is a DX format lens but I use both FX and DX cameras so it's not an issue. I've heard great things about the 60mm but not many reviews on the 40mm. Does anyone have one? Is it pretty sharp?