That particular photo was f6.3 -- the ISO was already at 1000.
In the back of my mind, I'm trying to balance ISO to get a fast shutter speed... while stopping down my consumer 55-200 a wee-bit to get it sharper.
Maybe something like f8.0 would have more in focus ... but sacrifice a bit of noise?
I would be at f9 for a shot like that, noise will be in the bokeh in the back which should be able to be reduced.