So I am going to be in the market for a macro lens for my Nikon D40. I was just interested to see what everyone thought about these two lenses since I can't decide which one I want. They are the Nikon Telephoto AF Micro-Nikkor 105mm f/2.8G ED-IF AF-S VR, and the Sigma MACRO 105mm F2.8 EX. I know that the Sigma won't autofocus with the D40, but is that really a factor in macro photography? I have never used a prime lens with macro, I have used zoom lenses and attachments when I was using a Sony DSC-H5. The only thing that kinda makes me want the Nikon lens is I can use it for portraits and have AF. But the Nikon is also like almost $800 bucks while the Sigma is $400. How is image quality between the two? Is one better than the other? I know the Nikon lens has a great following, but should I consider the Sigma? What about the Sigma Telephoto 150mm f/2.8 EX APO Macro EX DG HSM Autofocus Lens. That will AF with the D40, and it's $600, but will that focal length require me to be far away and cause blurry images due to camera shake? Any help would be greatly appreciated!