I am in search for a macro-lens for the D3. Earlier, when I used a D200, I was also searching intensively for a macrolens. Back then I had two requirements: ability to AF and IF (innerfocus) so the lens don't extend while focusing. During that search I found only to alternatives: Sigma 150mm f2/.8 Macro and Nikon Micro 105mm f2./8 VR. Even though price was not too important I did not like to read that the Nikons IQ seemed to be regarded as worse than the Sigma. The Sigma on the other hand had such a reach that it was much more specialized than the Nikon. Now, when I have the Nikon D3, I figure the Sigma 150mm will act more like the 105mm would behave on a DX-format camera? If that is the case the Sigma would be more practically versatile on the D3 than it ever was on the D200 (e.g. even tough you don't get the reach for bug-work like on the DX-format it will be easier to do copy work with it since the reach is 1.5x less than with the DX-format - just like the VR 105 was on DX)? If my thoughts are correct, my only concern with the lens would be the minimum aperture of f/22 and that some reviews say it's more susceptible to diffraction issues than other macro-lenses? I thought diffraction was a physical limit all lenses had and the problem was universally equal? Is this wrong, and some lenses cope better with diffraction at the same f-stop compared with others? Are there any other macro-options (minimum 100mm) recomended for the D3 with my two requirements (AF and Inner Focus)? If not, what about manual focus lenses? Are there any that has Inner Focus and can do 1:1 and is recomended? Thanks for your help!