I've been a bit pushed for time recently, so I haven't had time to make comments on this or Leif's 400mm lens threads -as a long time 400mm user I have some experience of using this focal length in all sorts of situations!
You've got a great lens there, Don - I think the original design might even go back to the late '70s. A mate of mine used to have a Nikon with 500mm mirror lens and when he trading in for this 400mm his photos improved by leaps and bounds.
I'll try to make a fuller reply this evening.
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