Thanks all, very helpful. Confirms some of my thoughts, and fills in the gaps nicely. Ray's primer was useful.
I'll muck about with a few different FL and see what the real-world testing on my setup shows, but it does seem like f/10 is a good default for my setup. I've never had an image at f/25 that I was all that happy with, so I'll give f/16 and f/12.5 a go...
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