Nikkor M 200mm f8 or Fujinon A 180 f9 - both lightweight, lots of coverage, but slow. If you are going to be in gloomy conditions then an f5.6 makes sense, perhaps the Fujinon 210mm f5.6 - with the lettering on the outside of the front element since it will be multicoated. The Fujinon 210mm f5.6 with inside lettering in an older copal shutter is single coated but just covers 8x10 so that is another option if you want to use it in a larger format.
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