I've been searching forums (including this one) and Google for a few weeks looking for good recommendations, forgive me if this was a recent thread and I missed it... I'm looking for wide-angle close up glass for Nikon DX (I have a D90). I've been using a Sigma 18-50mm f/2.8 DC EX Macro which does everything, though not really anything extremely well. It's a second generation version with .2m focus distance, and I've become very addicted to this capability though the results are rather soft. I'd like to upgrade. Sadly... I can't find much that allows similar 'focus right up to the glass' capability. At 18mm, I could focus the Sigma to under 2" away from the front of the lens. I'm not looking for macro ability on a longer focal lens, I'm hoping to find a wide angle at extreme close-up for the associated depth and perspective tricks. I'm not wedded to any specific approach (though convenience is nice, I'm no pro). I'm simply at the end of what a very nice but limited all-purpose zoom lens can give me. [intended subject matter: photographing small/intricate machinery as diorama, in effect as if it were large architecture. I want perspective and depth that implies being more part of the scene rather than looking at it at a distance from outside] Thank you all!