Rob and Don, Thank you so much for your explanations. I have visited the cambridgeincolour.com website to try to better understand lens function, and with your explanations, I now have a better sense of the CR, blurring, and other TC/Zoom abberations. I have a good collection of Nikkor zoom lenses, mostly from my SLR film camera days, but none of them really works well with my Nikon D200. Yesterday, I ordered the Nikkor 300mm f/4 AF-S and I already own a Kenko 300 Pro 1.4 TC. I am hoping that the Kenko will not be the weak link in the chain. Again, many thanks. Nancy
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