Steve,
I have the Nikkor M 300 f/9.0. I like it a lot. Plenty of movement for 4x5, and enough for 8x10 (I recently borrowed a friend's 8x10 and the lens covers with some movement). Photos are sharp (when I am functioning correctly), and I like the focal length for 4x5. To echo some of the other comments, I was looking for a used version of the Nikkor or the Fujinon C 300mm f/8.5. I would have bought either one and expected to be satisfied based on the many reviews on this site. It just so happened that the Nikkor came along first at a reasonable price. If you are thinking used, check with Jim at MPEX. He often has used Nikkor M 300s in stock. Normally they go for $495 or thereabouts.
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