The question wasn't about why the high res image was needed.
It was more about why it was sourced from a third party when you own the original.
I don't think the sourcing makes any material difference , I was just curious as to why it was done that way.
Both experts have made good points, and I'm left wondering if there would be as much diference in opinion if both had had the high res scans available.
Steve B
For another hobby I've had to reverse engineer some mechanical parts from photos. Not quite the same thing, but I'm somewhat familiar with reflections causing measurment problems on modern photos.
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