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Thanks to everyone for your input. I've learned so much from you. This is a great website, with very giving members.
I'm having so much fun with my D1x, that I purchased 3 more (average price $50 USD).
Yesterday I tested the following old Nikkor lenses on them: 105mm f/2.5; 135mm f/2.8 ; and 200mm f/4. While I know it's unfair to compare such a wide variety of focals to each other; I none-the-less found that I preferred the rendering of the non-Ai 135mm f/2.8 best (see attached photo). What other older Nikkors have you found that pair nicely with the D1X?
Next I'll like try a bunch of Zeiss Milvus lenses on the D1x to see which of them I prefer. Specifically, it will be interesting to see how the Zeiss Milvus 135/2 compares to the humble Nikkor non-Ai 135/2.8.