Phil that's great.
I certainly understand the weight issue. I'd recommend for you to consider
for the Mrs. the 300PF + 1.4TCiii.
I think when it is all over and written in stone the 300PF will be the favorite of my
little stint into Nikon land. It is just as sharp as the EOS 300ISii I sold seemingly long ago and
the bokeh belies its F4. A lot can be done at 420 and it takes the TC very well.
I'll be curious to see how she gets along with the 200-500mm. Last week in the refuge I noted
a man using that lens and it was always on a monopod yet it was a bright sunny day...he was
younger than me too.
But Poof and I also shoot Oly M1ii. She has the 300/4Pro and I use the PL100-400. I often get
the shot because of the zoom advantage.
Is there ever a perfect answer!
Forgot you'd alluded to the ISO ability of the D500. Here's my best (so far) pushing the ISO, in this
case to 6400. I know it's crap but still, with a crop sensor I was surprised. I downsampled for
noise control.
And that leads to the reports on the net I've read stating that the D500's sensor is very very close
to being ISO invariant (proof to me it is using a Sony sensor), in fact processing files from the D500
heavily reminds me of Sony files.
OK, rambling over 
Robert
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